diff --git a/package.json b/package.json
index 31fbf4d..151f417 100644
--- a/package.json
+++ b/package.json
@@ -27,12 +27,15 @@
   },
   "scripts": {
     "test": "jest",
-    "umd": "browserify index.js --standalone PropTypes -o prop-types.js && uglifyjs prop-types.js --compress unused,dead_code -o prop-types.min.js"
+    "umd": "NODE_ENV=development browserify index.js -t envify --standalone PropTypes -o prop-types.js",
+    "umd-min": "NODE_ENV=production browserify index.js -t envify --standalone PropTypes -o | uglifyjs --compress unused,dead_code -o prop-types.min.js",
+    "build": "yarn umd && yarn umd-min"
   },
   "devDependencies": {
     "babel-jest": "^19.0.0",
     "babel-preset-react": "^6.24.1",
     "browserify": "^14.3.0",
+    "envify": "^4.0.0",
     "jest": "^19.0.2",
     "react": "^15.5.1",
     "uglifyjs": "^2.4.10"
diff --git a/prop-types.js b/prop-types.js
index d7c7416..9f8c2b0 100644
--- a/prop-types.js
+++ b/prop-types.js
@@ -1,5 +1,4 @@
 (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.PropTypes = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
-(function (process){
 /**
  * Copyright 2013-present, Facebook, Inc.
  * All rights reserved.
@@ -30,7 +29,7 @@ var loggedTypeFailures = {};
  * @private
  */
 function checkPropTypes(typeSpecs, values, location, componentName, getStack) {
-  if (process.env.NODE_ENV !== 'production') {
+  if ("development" !== 'production') {
     for (var typeSpecName in typeSpecs) {
       if (typeSpecs.hasOwnProperty(typeSpecName)) {
         var error;
@@ -45,7 +44,7 @@ function checkPropTypes(typeSpecs, values, location, componentName, getStack) {
         } catch (ex) {
           error = ex;
         }
-        process.env.NODE_ENV !== 'production' ? warning(!error || error instanceof Error, '%s: type specification of %s `%s` is invalid; the type checker ' + 'function must return `null` or an `Error` but returned a %s. ' + 'You may have forgotten to pass an argument to the type checker ' + 'creator (arrayOf, instanceOf, objectOf, oneOf, oneOfType, and ' + 'shape all require an argument).', componentName || 'React class', location, typeSpecName, typeof error) : void 0;
+        "development" !== 'production' ? warning(!error || error instanceof Error, '%s: type specification of %s `%s` is invalid; the type checker ' + 'function must return `null` or an `Error` but returned a %s. ' + 'You may have forgotten to pass an argument to the type checker ' + 'creator (arrayOf, instanceOf, objectOf, oneOf, oneOfType, and ' + 'shape all require an argument).', componentName || 'React class', location, typeSpecName, typeof error) : void 0;
         if (error instanceof Error && !(error.message in loggedTypeFailures)) {
           // Only monitor this failure once because there tends to be a lot of the
           // same error.
@@ -53,7 +52,7 @@ function checkPropTypes(typeSpecs, values, location, componentName, getStack) {
 
           var stack = getStack ? getStack() : '';
 
-          process.env.NODE_ENV !== 'production' ? warning(false, 'Failed %s type: %s%s', location, error.message, stack != null ? stack : '') : void 0;
+          "development" !== 'production' ? warning(false, 'Failed %s type: %s%s', location, error.message, stack != null ? stack : '') : void 0;
         }
       }
     }
@@ -62,9 +61,7 @@ function checkPropTypes(typeSpecs, values, location, componentName, getStack) {
 
 module.exports = checkPropTypes;
 
-}).call(this,require('_process'))
-},{"./lib/ReactPropTypesSecret":4,"_process":8,"fbjs/lib/invariant":6,"fbjs/lib/warning":7}],2:[function(require,module,exports){
-(function (process){
+},{"./lib/ReactPropTypesSecret":4,"fbjs/lib/invariant":6,"fbjs/lib/warning":7}],2:[function(require,module,exports){
 /**
  * Copyright 2013-present, Facebook, Inc.
  * All rights reserved.
@@ -160,7 +157,7 @@ module.exports = function (isValidElement) {
 
   var ReactPropTypes;
 
-  if (process.env.NODE_ENV !== 'production') {
+  if ("development" !== 'production') {
     // Keep in sync with production version below
     ReactPropTypes = {
       array: createPrimitiveTypeChecker('array'),
@@ -244,17 +241,17 @@ module.exports = function (isValidElement) {
   PropTypeError.prototype = Error.prototype;
 
   function createChainableTypeChecker(validate) {
-    if (process.env.NODE_ENV !== 'production') {
+    if ("development" !== 'production') {
       var manualPropTypeCallCache = {};
     }
     function checkType(isRequired, props, propName, componentName, location, propFullName, secret) {
       componentName = componentName || ANONYMOUS;
       propFullName = propFullName || propName;
-      if (process.env.NODE_ENV !== 'production') {
+      if ("development" !== 'production') {
         if (secret !== ReactPropTypesSecret && typeof console !== 'undefined') {
           var cacheKey = componentName + ':' + propName;
           if (!manualPropTypeCallCache[cacheKey]) {
-            process.env.NODE_ENV !== 'production' ? warning(false, 'You are manually calling a React.PropTypes validation ' + 'function for the `%s` prop on `%s`. This is deprecated ' + 'and will not work in production with the next major version. ' + 'You may be seeing this warning due to a third-party PropTypes ' + 'library. See https://fb.me/react-warning-dont-call-proptypes ' + 'for details.', propFullName, componentName) : void 0;
+            "development" !== 'production' ? warning(false, 'You are manually calling a React.PropTypes validation ' + 'function for the `%s` prop on `%s`. This is deprecated ' + 'and will not work in production with the next major version. ' + 'You may be seeing this warning due to a third-party PropTypes ' + 'library. See https://fb.me/react-warning-dont-call-proptypes ' + 'for details.', propFullName, componentName) : void 0;
             manualPropTypeCallCache[cacheKey] = true;
           }
         }
@@ -346,7 +343,7 @@ module.exports = function (isValidElement) {
 
   function createEnumTypeChecker(expectedValues) {
     if (!Array.isArray(expectedValues)) {
-      process.env.NODE_ENV !== 'production' ? warning(false, 'Invalid argument supplied to oneOf, expected an instance of array.') : void 0;
+      "development" !== 'production' ? warning(false, 'Invalid argument supplied to oneOf, expected an instance of array.') : void 0;
       return emptyFunction.thatReturnsNull;
     }
 
@@ -389,7 +386,7 @@ module.exports = function (isValidElement) {
 
   function createUnionTypeChecker(arrayOfTypeCheckers) {
     if (!Array.isArray(arrayOfTypeCheckers)) {
-      process.env.NODE_ENV !== 'production' ? warning(false, 'Invalid argument supplied to oneOfType, expected an instance of array.') : void 0;
+      "development" !== 'production' ? warning(false, 'Invalid argument supplied to oneOfType, expected an instance of array.') : void 0;
       return emptyFunction.thatReturnsNull;
     }
 
@@ -550,8 +547,7 @@ module.exports = function (isValidElement) {
   return ReactPropTypes;
 };
 
-}).call(this,require('_process'))
-},{"./checkPropTypes":1,"./lib/ReactPropTypesSecret":4,"_process":8,"fbjs/lib/emptyFunction":5,"fbjs/lib/invariant":6,"fbjs/lib/warning":7}],3:[function(require,module,exports){
+},{"./checkPropTypes":1,"./lib/ReactPropTypesSecret":4,"fbjs/lib/emptyFunction":5,"fbjs/lib/invariant":6,"fbjs/lib/warning":7}],3:[function(require,module,exports){
 /**
  * Copyright 2013-present, Facebook, Inc.
  * All rights reserved.
@@ -632,7 +628,6 @@ emptyFunction.thatReturnsArgument = function (arg) {
 
 module.exports = emptyFunction;
 },{}],6:[function(require,module,exports){
-(function (process){
 /**
  * Copyright (c) 2013-present, Facebook, Inc.
  * All rights reserved.
@@ -658,7 +653,7 @@ module.exports = emptyFunction;
 
 var validateFormat = function validateFormat(format) {};
 
-if (process.env.NODE_ENV !== 'production') {
+if ("development" !== 'production') {
   validateFormat = function validateFormat(format) {
     if (format === undefined) {
       throw new Error('invariant requires an error message argument');
@@ -688,9 +683,7 @@ function invariant(condition, format, a, b, c, d, e, f) {
 }
 
 module.exports = invariant;
-}).call(this,require('_process'))
-},{"_process":8}],7:[function(require,module,exports){
-(function (process){
+},{}],7:[function(require,module,exports){
 /**
  * Copyright 2014-2015, Facebook, Inc.
  * All rights reserved.
@@ -714,7 +707,7 @@ var emptyFunction = require('./emptyFunction');
 
 var warning = emptyFunction;
 
-if (process.env.NODE_ENV !== 'production') {
+if ("development" !== 'production') {
   (function () {
     var printWarning = function printWarning(format) {
       for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
@@ -757,188 +750,5 @@ if (process.env.NODE_ENV !== 'production') {
 }
 
 module.exports = warning;
-}).call(this,require('_process'))
-},{"./emptyFunction":5,"_process":8}],8:[function(require,module,exports){
-// shim for using process in browser
-var process = module.exports = {};
-
-// cached from whatever global is present so that test runners that stub it
-// don't break things.  But we need to wrap it in a try catch in case it is
-// wrapped in strict mode code which doesn't define any globals.  It's inside a
-// function because try/catches deoptimize in certain engines.
-
-var cachedSetTimeout;
-var cachedClearTimeout;
-
-function defaultSetTimout() {
-    throw new Error('setTimeout has not been defined');
-}
-function defaultClearTimeout () {
-    throw new Error('clearTimeout has not been defined');
-}
-(function () {
-    try {
-        if (typeof setTimeout === 'function') {
-            cachedSetTimeout = setTimeout;
-        } else {
-            cachedSetTimeout = defaultSetTimout;
-        }
-    } catch (e) {
-        cachedSetTimeout = defaultSetTimout;
-    }
-    try {
-        if (typeof clearTimeout === 'function') {
-            cachedClearTimeout = clearTimeout;
-        } else {
-            cachedClearTimeout = defaultClearTimeout;
-        }
-    } catch (e) {
-        cachedClearTimeout = defaultClearTimeout;
-    }
-} ())
-function runTimeout(fun) {
-    if (cachedSetTimeout === setTimeout) {
-        //normal enviroments in sane situations
-        return setTimeout(fun, 0);
-    }
-    // if setTimeout wasn't available but was latter defined
-    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
-        cachedSetTimeout = setTimeout;
-        return setTimeout(fun, 0);
-    }
-    try {
-        // when when somebody has screwed with setTimeout but no I.E. maddness
-        return cachedSetTimeout(fun, 0);
-    } catch(e){
-        try {
-            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
-            return cachedSetTimeout.call(null, fun, 0);
-        } catch(e){
-            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
-            return cachedSetTimeout.call(this, fun, 0);
-        }
-    }
-
-
-}
-function runClearTimeout(marker) {
-    if (cachedClearTimeout === clearTimeout) {
-        //normal enviroments in sane situations
-        return clearTimeout(marker);
-    }
-    // if clearTimeout wasn't available but was latter defined
-    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
-        cachedClearTimeout = clearTimeout;
-        return clearTimeout(marker);
-    }
-    try {
-        // when when somebody has screwed with setTimeout but no I.E. maddness
-        return cachedClearTimeout(marker);
-    } catch (e){
-        try {
-            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
-            return cachedClearTimeout.call(null, marker);
-        } catch (e){
-            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
-            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
-            return cachedClearTimeout.call(this, marker);
-        }
-    }
-
-
-
-}
-var queue = [];
-var draining = false;
-var currentQueue;
-var queueIndex = -1;
-
-function cleanUpNextTick() {
-    if (!draining || !currentQueue) {
-        return;
-    }
-    draining = false;
-    if (currentQueue.length) {
-        queue = currentQueue.concat(queue);
-    } else {
-        queueIndex = -1;
-    }
-    if (queue.length) {
-        drainQueue();
-    }
-}
-
-function drainQueue() {
-    if (draining) {
-        return;
-    }
-    var timeout = runTimeout(cleanUpNextTick);
-    draining = true;
-
-    var len = queue.length;
-    while(len) {
-        currentQueue = queue;
-        queue = [];
-        while (++queueIndex < len) {
-            if (currentQueue) {
-                currentQueue[queueIndex].run();
-            }
-        }
-        queueIndex = -1;
-        len = queue.length;
-    }
-    currentQueue = null;
-    draining = false;
-    runClearTimeout(timeout);
-}
-
-process.nextTick = function (fun) {
-    var args = new Array(arguments.length - 1);
-    if (arguments.length > 1) {
-        for (var i = 1; i < arguments.length; i++) {
-            args[i - 1] = arguments[i];
-        }
-    }
-    queue.push(new Item(fun, args));
-    if (queue.length === 1 && !draining) {
-        runTimeout(drainQueue);
-    }
-};
-
-// v8 likes predictible objects
-function Item(fun, array) {
-    this.fun = fun;
-    this.array = array;
-}
-Item.prototype.run = function () {
-    this.fun.apply(null, this.array);
-};
-process.title = 'browser';
-process.browser = true;
-process.env = {};
-process.argv = [];
-process.version = ''; // empty string to avoid regexp issues
-process.versions = {};
-
-function noop() {}
-
-process.on = noop;
-process.addListener = noop;
-process.once = noop;
-process.off = noop;
-process.removeListener = noop;
-process.removeAllListeners = noop;
-process.emit = noop;
-
-process.binding = function (name) {
-    throw new Error('process.binding is not supported');
-};
-
-process.cwd = function () { return '/' };
-process.chdir = function (dir) {
-    throw new Error('process.chdir is not supported');
-};
-process.umask = function() { return 0; };
-
-},{}]},{},[3])(3)
+},{"./emptyFunction":5}]},{},[3])(3)
 });
\ No newline at end of file
diff --git a/prop-types.min.js b/prop-types.min.js
index 04a34f7..7b66690 100644
--- a/prop-types.min.js
+++ b/prop-types.min.js
@@ -1 +1 @@
-!function(f){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=f();else if("function"==typeof define&&define.amd)define([],f);else{var g;g="undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this,g.PropTypes=f()}}(function(){return function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a="function"==typeof require&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}for(var i="function"==typeof require&&require,o=0;o<r.length;o++)s(r[o]);return s}({1:[function(require,module){(function(process){"use strict";function checkPropTypes(typeSpecs,values,location,componentName,getStack){if("production"!==process.env.NODE_ENV)for(var typeSpecName in typeSpecs)if(typeSpecs.hasOwnProperty(typeSpecName)){var error;try{invariant("function"==typeof typeSpecs[typeSpecName],"%s: %s type `%s` is invalid; it must be a function, usually from React.PropTypes.",componentName||"React class",location,typeSpecName),error=typeSpecs[typeSpecName](values,typeSpecName,componentName,location,null,ReactPropTypesSecret)}catch(ex){error=ex}if("production"!==process.env.NODE_ENV?warning(!error||error instanceof Error,"%s: type specification of %s `%s` is invalid; the type checker function must return `null` or an `Error` but returned a %s. You may have forgotten to pass an argument to the type checker creator (arrayOf, instanceOf, objectOf, oneOf, oneOfType, and shape all require an argument).",componentName||"React class",location,typeSpecName,typeof error):void 0,error instanceof Error&&!(error.message in loggedTypeFailures)){loggedTypeFailures[error.message]=!0;var stack=getStack?getStack():"";"production"!==process.env.NODE_ENV?warning(!1,"Failed %s type: %s%s",location,error.message,null!=stack?stack:""):void 0}}}var invariant=require("fbjs/lib/invariant"),warning=require("fbjs/lib/warning"),ReactPropTypesSecret=require("./lib/ReactPropTypesSecret"),loggedTypeFailures={};module.exports=checkPropTypes}).call(this,require("_process"))},{"./lib/ReactPropTypesSecret":4,_process:8,"fbjs/lib/invariant":6,"fbjs/lib/warning":7}],2:[function(require,module){(function(process){"use strict";var emptyFunction=require("fbjs/lib/emptyFunction"),invariant=require("fbjs/lib/invariant"),warning=require("fbjs/lib/warning"),ReactPropTypesSecret=require("./lib/ReactPropTypesSecret"),checkPropTypes=require("./checkPropTypes");module.exports=function(isValidElement){function getIteratorFn(maybeIterable){var iteratorFn=maybeIterable&&(ITERATOR_SYMBOL&&maybeIterable[ITERATOR_SYMBOL]||maybeIterable[FAUX_ITERATOR_SYMBOL]);return"function"==typeof iteratorFn?iteratorFn:void 0}function is(x,y){return x===y?0!==x||1/x===1/y:x!==x&&y!==y}function PropTypeError(message){this.message=message,this.stack=""}function createChainableTypeChecker(validate){function checkType(isRequired,props,propName,componentName,location,propFullName,secret){if(componentName=componentName||ANONYMOUS,propFullName=propFullName||propName,"production"!==process.env.NODE_ENV&&secret!==ReactPropTypesSecret&&"undefined"!=typeof console){var cacheKey=componentName+":"+propName;manualPropTypeCallCache[cacheKey]||("production"!==process.env.NODE_ENV?warning(!1,"You are manually calling a React.PropTypes validation function for the `%s` prop on `%s`. This is deprecated and will not work in production with the next major version. You may be seeing this warning due to a third-party PropTypes library. See https://fb.me/react-warning-dont-call-proptypes for details.",propFullName,componentName):void 0,manualPropTypeCallCache[cacheKey]=!0)}return null==props[propName]?isRequired?new PropTypeError(null===props[propName]?"The "+location+" `"+propFullName+"` is marked as required "+("in `"+componentName+"`, but its value is `null`."):"The "+location+" `"+propFullName+"` is marked as required in "+("`"+componentName+"`, but its value is `undefined`.")):null:validate(props,propName,componentName,location,propFullName)}if("production"!==process.env.NODE_ENV)var manualPropTypeCallCache={};var chainedCheckType=checkType.bind(null,!1);return chainedCheckType.isRequired=checkType.bind(null,!0),chainedCheckType}function createPrimitiveTypeChecker(expectedType){function validate(props,propName,componentName,location,propFullName){var propValue=props[propName],propType=getPropType(propValue);if(propType!==expectedType){var preciseType=getPreciseType(propValue);return new PropTypeError("Invalid "+location+" `"+propFullName+"` of type "+("`"+preciseType+"` supplied to `"+componentName+"`, expected ")+("`"+expectedType+"`."))}return null}return createChainableTypeChecker(validate)}function createAnyTypeChecker(){return createChainableTypeChecker(emptyFunction.thatReturnsNull)}function createArrayOfTypeChecker(typeChecker){function validate(props,propName,componentName,location,propFullName){if("function"!=typeof typeChecker)return new PropTypeError("Property `"+propFullName+"` of component `"+componentName+"` has invalid PropType notation inside arrayOf.");var propValue=props[propName];if(!Array.isArray(propValue)){var propType=getPropType(propValue);return new PropTypeError("Invalid "+location+" `"+propFullName+"` of type "+("`"+propType+"` supplied to `"+componentName+"`, expected an array."))}for(var i=0;i<propValue.length;i++){var error=typeChecker(propValue,i,componentName,location,propFullName+"["+i+"]",ReactPropTypesSecret);if(error instanceof Error)return error}return null}return createChainableTypeChecker(validate)}function createElementTypeChecker(){function validate(props,propName,componentName,location,propFullName){var propValue=props[propName];if(!isValidElement(propValue)){var propType=getPropType(propValue);return new PropTypeError("Invalid "+location+" `"+propFullName+"` of type "+("`"+propType+"` supplied to `"+componentName+"`, expected a single ReactElement."))}return null}return createChainableTypeChecker(validate)}function createInstanceTypeChecker(expectedClass){function validate(props,propName,componentName,location,propFullName){if(!(props[propName]instanceof expectedClass)){var expectedClassName=expectedClass.name||ANONYMOUS,actualClassName=getClassName(props[propName]);return new PropTypeError("Invalid "+location+" `"+propFullName+"` of type "+("`"+actualClassName+"` supplied to `"+componentName+"`, expected ")+("instance of `"+expectedClassName+"`."))}return null}return createChainableTypeChecker(validate)}function createEnumTypeChecker(expectedValues){function validate(props,propName,componentName,location,propFullName){for(var propValue=props[propName],i=0;i<expectedValues.length;i++)if(is(propValue,expectedValues[i]))return null;var valuesString=JSON.stringify(expectedValues);return new PropTypeError("Invalid "+location+" `"+propFullName+"` of value `"+propValue+"` "+("supplied to `"+componentName+"`, expected one of "+valuesString+"."))}return Array.isArray(expectedValues)?createChainableTypeChecker(validate):("production"!==process.env.NODE_ENV?warning(!1,"Invalid argument supplied to oneOf, expected an instance of array."):void 0,emptyFunction.thatReturnsNull)}function createObjectOfTypeChecker(typeChecker){function validate(props,propName,componentName,location,propFullName){if("function"!=typeof typeChecker)return new PropTypeError("Property `"+propFullName+"` of component `"+componentName+"` has invalid PropType notation inside objectOf.");var propValue=props[propName],propType=getPropType(propValue);if("object"!==propType)return new PropTypeError("Invalid "+location+" `"+propFullName+"` of type "+("`"+propType+"` supplied to `"+componentName+"`, expected an object."));for(var key in propValue)if(propValue.hasOwnProperty(key)){var error=typeChecker(propValue,key,componentName,location,propFullName+"."+key,ReactPropTypesSecret);if(error instanceof Error)return error}return null}return createChainableTypeChecker(validate)}function createUnionTypeChecker(arrayOfTypeCheckers){function validate(props,propName,componentName,location,propFullName){for(var i=0;i<arrayOfTypeCheckers.length;i++){var checker=arrayOfTypeCheckers[i];if(null==checker(props,propName,componentName,location,propFullName,ReactPropTypesSecret))return null}return new PropTypeError("Invalid "+location+" `"+propFullName+"` supplied to "+("`"+componentName+"`."))}return Array.isArray(arrayOfTypeCheckers)?createChainableTypeChecker(validate):("production"!==process.env.NODE_ENV?warning(!1,"Invalid argument supplied to oneOfType, expected an instance of array."):void 0,emptyFunction.thatReturnsNull)}function createNodeChecker(){function validate(props,propName,componentName,location,propFullName){return isNode(props[propName])?null:new PropTypeError("Invalid "+location+" `"+propFullName+"` supplied to "+("`"+componentName+"`, expected a ReactNode."))}return createChainableTypeChecker(validate)}function createShapeTypeChecker(shapeTypes){function validate(props,propName,componentName,location,propFullName){var propValue=props[propName],propType=getPropType(propValue);if("object"!==propType)return new PropTypeError("Invalid "+location+" `"+propFullName+"` of type `"+propType+"` "+("supplied to `"+componentName+"`, expected `object`."));for(var key in shapeTypes){var checker=shapeTypes[key];if(checker){var error=checker(propValue,key,componentName,location,propFullName+"."+key,ReactPropTypesSecret);if(error)return error}}return null}return createChainableTypeChecker(validate)}function isNode(propValue){switch(typeof propValue){case"number":case"string":case"undefined":return!0;case"boolean":return!propValue;case"object":if(Array.isArray(propValue))return propValue.every(isNode);if(null===propValue||isValidElement(propValue))return!0;var iteratorFn=getIteratorFn(propValue);if(!iteratorFn)return!1;var step,iterator=iteratorFn.call(propValue);if(iteratorFn!==propValue.entries){for(;!(step=iterator.next()).done;)if(!isNode(step.value))return!1}else for(;!(step=iterator.next()).done;){var entry=step.value;if(entry&&!isNode(entry[1]))return!1}return!0;default:return!1}}function isSymbol(propType,propValue){return"symbol"===propType?!0:"Symbol"===propValue["@@toStringTag"]?!0:"function"==typeof Symbol&&propValue instanceof Symbol?!0:!1}function getPropType(propValue){var propType=typeof propValue;return Array.isArray(propValue)?"array":propValue instanceof RegExp?"object":isSymbol(propType,propValue)?"symbol":propType}function getPreciseType(propValue){var propType=getPropType(propValue);if("object"===propType){if(propValue instanceof Date)return"date";if(propValue instanceof RegExp)return"regexp"}return propType}function getClassName(propValue){return propValue.constructor&&propValue.constructor.name?propValue.constructor.name:ANONYMOUS}var ReactPropTypes,ITERATOR_SYMBOL="function"==typeof Symbol&&Symbol.iterator,FAUX_ITERATOR_SYMBOL="@@iterator",ANONYMOUS="<<anonymous>>";if("production"!==process.env.NODE_ENV)ReactPropTypes={array:createPrimitiveTypeChecker("array"),bool:createPrimitiveTypeChecker("boolean"),func:createPrimitiveTypeChecker("function"),number:createPrimitiveTypeChecker("number"),object:createPrimitiveTypeChecker("object"),string:createPrimitiveTypeChecker("string"),symbol:createPrimitiveTypeChecker("symbol"),any:createAnyTypeChecker(),arrayOf:createArrayOfTypeChecker,element:createElementTypeChecker(),instanceOf:createInstanceTypeChecker,node:createNodeChecker(),objectOf:createObjectOfTypeChecker,oneOf:createEnumTypeChecker,oneOfType:createUnionTypeChecker,shape:createShapeTypeChecker};else{var productionTypeChecker=function(){invariant(!1,"React.PropTypes type checking code is stripped in production.")};productionTypeChecker.isRequired=productionTypeChecker;var getProductionTypeChecker=function(){return productionTypeChecker};ReactPropTypes={array:productionTypeChecker,bool:productionTypeChecker,func:productionTypeChecker,number:productionTypeChecker,object:productionTypeChecker,string:productionTypeChecker,symbol:productionTypeChecker,any:productionTypeChecker,arrayOf:getProductionTypeChecker,element:productionTypeChecker,instanceOf:getProductionTypeChecker,node:productionTypeChecker,objectOf:getProductionTypeChecker,oneOf:getProductionTypeChecker,oneOfType:getProductionTypeChecker,shape:getProductionTypeChecker}}return PropTypeError.prototype=Error.prototype,ReactPropTypes.checkPropTypes=checkPropTypes,ReactPropTypes.PropTypes=ReactPropTypes,ReactPropTypes}}).call(this,require("_process"))},{"./checkPropTypes":1,"./lib/ReactPropTypesSecret":4,_process:8,"fbjs/lib/emptyFunction":5,"fbjs/lib/invariant":6,"fbjs/lib/warning":7}],3:[function(require,module){function isValidElement(object){return"object"==typeof object&&null!==object&&object.$$typeof===REACT_ELEMENT_TYPE}var factory=require("./factory"),REACT_ELEMENT_TYPE="function"==typeof Symbol&&Symbol["for"]&&Symbol["for"]("react.element")||60103;module.exports=factory(isValidElement)},{"./factory":2}],4:[function(require,module){"use strict";var ReactPropTypesSecret="SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED";module.exports=ReactPropTypesSecret},{}],5:[function(require,module){"use strict";function makeEmptyFunction(arg){return function(){return arg}}var emptyFunction=function(){};emptyFunction.thatReturns=makeEmptyFunction,emptyFunction.thatReturnsFalse=makeEmptyFunction(!1),emptyFunction.thatReturnsTrue=makeEmptyFunction(!0),emptyFunction.thatReturnsNull=makeEmptyFunction(null),emptyFunction.thatReturnsThis=function(){return this},emptyFunction.thatReturnsArgument=function(arg){return arg},module.exports=emptyFunction},{}],6:[function(require,module){(function(process){"use strict";function invariant(condition,format,a,b,c,d,e,f){if(validateFormat(format),!condition){var error;if(void 0===format)error=new Error("Minified exception occurred; use the non-minified dev environment for the full error message and additional helpful warnings.");else{var args=[a,b,c,d,e,f],argIndex=0;error=new Error(format.replace(/%s/g,function(){return args[argIndex++]})),error.name="Invariant Violation"}throw error.framesToPop=1,error}}var validateFormat=function(){};"production"!==process.env.NODE_ENV&&(validateFormat=function(format){if(void 0===format)throw new Error("invariant requires an error message argument")}),module.exports=invariant}).call(this,require("_process"))},{_process:8}],7:[function(require,module){(function(process){"use strict";var emptyFunction=require("./emptyFunction"),warning=emptyFunction;"production"!==process.env.NODE_ENV&&!function(){var printWarning=function(format){for(var _len=arguments.length,args=Array(_len>1?_len-1:0),_key=1;_len>_key;_key++)args[_key-1]=arguments[_key];var argIndex=0,message="Warning: "+format.replace(/%s/g,function(){return args[argIndex++]});"undefined"!=typeof console&&console.error(message);try{throw new Error(message)}catch(x){}};warning=function(condition,format){if(void 0===format)throw new Error("`warning(condition, format, ...args)` requires a warning message argument");if(0!==format.indexOf("Failed Composite propType: ")&&!condition){for(var _len2=arguments.length,args=Array(_len2>2?_len2-2:0),_key2=2;_len2>_key2;_key2++)args[_key2-2]=arguments[_key2];printWarning.apply(void 0,[format].concat(args))}}}(),module.exports=warning}).call(this,require("_process"))},{"./emptyFunction":5,_process:8}],8:[function(require,module){function defaultSetTimout(){throw new Error("setTimeout has not been defined")}function defaultClearTimeout(){throw new Error("clearTimeout has not been defined")}function runTimeout(fun){if(cachedSetTimeout===setTimeout)return setTimeout(fun,0);if((cachedSetTimeout===defaultSetTimout||!cachedSetTimeout)&&setTimeout)return cachedSetTimeout=setTimeout,setTimeout(fun,0);try{return cachedSetTimeout(fun,0)}catch(e){try{return cachedSetTimeout.call(null,fun,0)}catch(e){return cachedSetTimeout.call(this,fun,0)}}}function runClearTimeout(marker){if(cachedClearTimeout===clearTimeout)return clearTimeout(marker);if((cachedClearTimeout===defaultClearTimeout||!cachedClearTimeout)&&clearTimeout)return cachedClearTimeout=clearTimeout,clearTimeout(marker);try{return cachedClearTimeout(marker)}catch(e){try{return cachedClearTimeout.call(null,marker)}catch(e){return cachedClearTimeout.call(this,marker)}}}function cleanUpNextTick(){draining&&currentQueue&&(draining=!1,currentQueue.length?queue=currentQueue.concat(queue):queueIndex=-1,queue.length&&drainQueue())}function drainQueue(){if(!draining){var timeout=runTimeout(cleanUpNextTick);draining=!0;for(var len=queue.length;len;){for(currentQueue=queue,queue=[];++queueIndex<len;)currentQueue&&currentQueue[queueIndex].run();queueIndex=-1,len=queue.length}currentQueue=null,draining=!1,runClearTimeout(timeout)}}function Item(fun,array){this.fun=fun,this.array=array}function noop(){}var cachedSetTimeout,cachedClearTimeout,process=module.exports={};!function(){try{cachedSetTimeout="function"==typeof setTimeout?setTimeout:defaultSetTimout}catch(e){cachedSetTimeout=defaultSetTimout}try{cachedClearTimeout="function"==typeof clearTimeout?clearTimeout:defaultClearTimeout}catch(e){cachedClearTimeout=defaultClearTimeout}}();var currentQueue,queue=[],draining=!1,queueIndex=-1;process.nextTick=function(fun){var args=new Array(arguments.length-1);if(arguments.length>1)for(var i=1;i<arguments.length;i++)args[i-1]=arguments[i];queue.push(new Item(fun,args)),1!==queue.length||draining||runTimeout(drainQueue)},Item.prototype.run=function(){this.fun.apply(null,this.array)},process.title="browser",process.browser=!0,process.env={},process.argv=[],process.version="",process.versions={},process.on=noop,process.addListener=noop,process.once=noop,process.off=noop,process.removeListener=noop,process.removeAllListeners=noop,process.emit=noop,process.binding=function(){throw new Error("process.binding is not supported")},process.cwd=function(){return"/"},process.chdir=function(){throw new Error("process.chdir is not supported")},process.umask=function(){return 0}},{}]},{},[3])(3)});
\ No newline at end of file
+!function(f){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=f();else if("function"==typeof define&&define.amd)define([],f);else{var g;g="undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this,g.PropTypes=f()}}(function(){return function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a="function"==typeof require&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}for(var i="function"==typeof require&&require,o=0;o<r.length;o++)s(r[o]);return s}({1:[function(require,module){"use strict";function checkPropTypes(typeSpecs,values,location,componentName,getStack){}require("fbjs/lib/invariant"),require("fbjs/lib/warning"),require("./lib/ReactPropTypesSecret");module.exports=checkPropTypes},{"./lib/ReactPropTypesSecret":4,"fbjs/lib/invariant":6,"fbjs/lib/warning":7}],2:[function(require,module){"use strict";var invariant=(require("fbjs/lib/emptyFunction"),require("fbjs/lib/invariant")),checkPropTypes=(require("fbjs/lib/warning"),require("./lib/ReactPropTypesSecret"),require("./checkPropTypes"));module.exports=function(isValidElement){function PropTypeError(message){this.message=message,this.stack=""}var ReactPropTypes,productionTypeChecker=("function"==typeof Symbol&&Symbol.iterator,function(){invariant(!1,"React.PropTypes type checking code is stripped in production.")});productionTypeChecker.isRequired=productionTypeChecker;var getProductionTypeChecker=function(){return productionTypeChecker};return ReactPropTypes={array:productionTypeChecker,bool:productionTypeChecker,func:productionTypeChecker,number:productionTypeChecker,object:productionTypeChecker,string:productionTypeChecker,symbol:productionTypeChecker,any:productionTypeChecker,arrayOf:getProductionTypeChecker,element:productionTypeChecker,instanceOf:getProductionTypeChecker,node:productionTypeChecker,objectOf:getProductionTypeChecker,oneOf:getProductionTypeChecker,oneOfType:getProductionTypeChecker,shape:getProductionTypeChecker},PropTypeError.prototype=Error.prototype,ReactPropTypes.checkPropTypes=checkPropTypes,ReactPropTypes.PropTypes=ReactPropTypes,ReactPropTypes}},{"./checkPropTypes":1,"./lib/ReactPropTypesSecret":4,"fbjs/lib/emptyFunction":5,"fbjs/lib/invariant":6,"fbjs/lib/warning":7}],3:[function(require,module){function isValidElement(object){return"object"==typeof object&&null!==object&&object.$$typeof===REACT_ELEMENT_TYPE}var factory=require("./factory"),REACT_ELEMENT_TYPE="function"==typeof Symbol&&Symbol["for"]&&Symbol["for"]("react.element")||60103;module.exports=factory(isValidElement)},{"./factory":2}],4:[function(require,module){"use strict";var ReactPropTypesSecret="SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED";module.exports=ReactPropTypesSecret},{}],5:[function(require,module){"use strict";function makeEmptyFunction(arg){return function(){return arg}}var emptyFunction=function(){};emptyFunction.thatReturns=makeEmptyFunction,emptyFunction.thatReturnsFalse=makeEmptyFunction(!1),emptyFunction.thatReturnsTrue=makeEmptyFunction(!0),emptyFunction.thatReturnsNull=makeEmptyFunction(null),emptyFunction.thatReturnsThis=function(){return this},emptyFunction.thatReturnsArgument=function(arg){return arg},module.exports=emptyFunction},{}],6:[function(require,module){"use strict";function invariant(condition,format,a,b,c,d,e,f){if(validateFormat(format),!condition){var error;if(void 0===format)error=new Error("Minified exception occurred; use the non-minified dev environment for the full error message and additional helpful warnings.");else{var args=[a,b,c,d,e,f],argIndex=0;error=new Error(format.replace(/%s/g,function(){return args[argIndex++]})),error.name="Invariant Violation"}throw error.framesToPop=1,error}}var validateFormat=function(){};module.exports=invariant},{}],7:[function(require,module){"use strict";var emptyFunction=require("./emptyFunction"),warning=emptyFunction;module.exports=warning},{"./emptyFunction":5}]},{},[3])(3)});
\ No newline at end of file
diff --git a/yarn.lock b/yarn.lock
index 4061956..20b2408 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -889,6 +889,13 @@ encoding@^0.1.11:
   dependencies:
     iconv-lite "~0.4.13"
 
+envify@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/envify/-/envify-4.0.0.tgz#f791343e3d11cc29cce41150300a8af61c66cab0"
+  dependencies:
+    esprima "~3.1.0"
+    through "~2.3.4"
+
 "errno@>=0.1.1 <0.2.0-0":
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/errno/-/errno-0.1.4.tgz#b896e23a9e5e8ba33871fc996abd3635fc9a1c7d"
@@ -920,7 +927,7 @@ esprima@^2.7.1:
   version "2.7.3"
   resolved "https://registry.yarnpkg.com/esprima/-/esprima-2.7.3.tgz#96e3b70d5779f6ad49cd032673d1c312767ba581"
 
-esprima@^3.1.1:
+esprima@^3.1.1, esprima@~3.1.0:
   version "3.1.3"
   resolved "https://registry.yarnpkg.com/esprima/-/esprima-3.1.3.tgz#fdca51cee6133895e3c88d535ce49dbff62a4633"
 
@@ -2595,7 +2602,7 @@ through2@^2.0.0:
     readable-stream "^2.1.5"
     xtend "~4.0.1"
 
-"through@>=2.2.7 <3":
+"through@>=2.2.7 <3", through@~2.3.4:
   version "2.3.8"
   resolved "https://registry.yarnpkg.com/through/-/through-2.3.8.tgz#0dd4c9ffaabc357960b1b724115d7e0e86a2e1f5"