Remove Grunt and update some documentation

.jshintrc

@@ -1,12 +1,4 @@
 {
-  "globals": {
-    "SHIFTY_DEBUG_NOW": true,
-    "root": true,
-    "Tweenable": true,
-    "module": true,
-    "define": true
-  },
-
   "asi": false,
   "boss": true,
   "browser": true,

CONTRIBUTING.md

@@ -24,33 +24,18 @@ released (built and tagged).  When making a Pull Request, please branch off of
 `develop` and request to merge back into it.  `master` is only merged into from
 `develop`.
 
-## Versioning
-
-Shifty uses [SemVer](http://semver.org/) for versioning.  If you modify the
-source code, please adhere to this convention (in all likelihood you will only
-need to modify the rightmost digit by one).  To change the version, you'll need
-to update the version in two places: `bower.json` and `package.json` (look for
-the lines that say `version`).  The version numbers in these two files must be
-kept in sync.
-
 ## Building
 
-Shifty uses [Grunt](http://gruntjs.com/) (version 0.4.1 or later, globally
-installed) to generate the distributable binaries.  If you make any changes to
-the source code and need to rebuild the binaries for testing or an alternative
-release, run this command:
-
 ````
-$: grunt build
+$: npm run build
 ````
 
 ## Testing
 
-Please make sure that all tests pass before submitting a Pull Request.  To run
-the tests on the command line (requires [PhantomJS](http://phantomjs.org/)):
+Please make sure that all tests pass before submitting a Pull Request.
 
 ````
-$: grunt qunit
+$: npm test
 ````
 
 You can also run the tests in the browser.  They are in `tests/`.  If you are
@@ -62,5 +47,5 @@ Please try to remain consitent with existing code.  To automatically check for
 style issues or other potential problems, you can run:
 
 ````
-$: grunt jshint
+$: npm run lint
 ````

README.md

@@ -39,20 +39,13 @@ are:
 
 ## Installation
 
-Shifty is available through NPM and Bower:
-
 ````
 npm install --save shifty
 ````
 
-````
-bower install --save shifty
-````
-
 ## Browser compatibility
 
-Shifty officially supports Internet Explorer 8 and up, as well as all Evergreen
-browsers.
+Shifty officially supports Evergreen browsers.
 
 ## Using Shifty
 
@@ -268,9 +261,7 @@ step.
 
 ## Building Shifty
 
-Shifty uses [nodejs](http://nodejs.org) and [Grunt](http://gruntjs.com/) for
-the build system. It also requires a handful of Node modules for the build
-process.  Install the dependencies via npm like so:
+First, install the dependencies via npm like so:
 
 ````
 $: npm install
@@ -279,48 +270,29 @@ $: npm install
 Once those are installed, do this at the command line to build the project:
 
 ````
-$: grunt build
-````
-
-The the default `build` task creates a binary that includes all extensions.
-You can also create minimal binaries that only include the bare essentials for
-Shifty to run:
-
-````
-$: grunt build-minimal
-````
-
-Note that a minimal build includes no tweening formulas.  You can customize and
-add build targets in the `grunt.js` file.  You can also lint the code and run
-the unit tests with the default Grunt task:
-
-````
-$: grunt
+$: npm run build
 ````
 
 To generate the documentation:
 
 ````
-$: grunt yuidoc
+$: npm run doc
 ````
 
-## AMD and NodeJS
+## Loading Shifty
 
-If an AMD loader (eg. [RequireJS](http://requirejs.org/),
-[Curl.js](https://github.com/unscriptable/curl)) is present on the page, Shifty
-won't generate any globals, so to use it you must list `"shifty"` as
-a dependency.
+Shifty exposes a UMD module, so you can load it however you like:
 
 ````javascript
-define(['shifty'], function(Tweenable){
-  var tweenable = new Tweenable();
-});
+import { Tweenable } from 'shifty';
 ````
 
-Shifty can also be used in NodeJS:
+Or:
 
 ````javascript
-var Tweenable = require('shifty');
+define(['shifty'], function(shifty){
+  var tweenable = new shifty.Tweenable();
+});
 ````
 
 ## Contributors

package.json

@@ -13,15 +13,8 @@
     "babel-core": "^6.22.1",
     "babel-loader": "^6.2.10",
     "babel-preset-es2015": "^6.22.0",
-    "grunt": "~0.4.1",
-    "grunt-bump": "0.0.13",
-    "grunt-contrib-concat": "~0.1.3",
-    "grunt-contrib-copy": "^0.7.0",
-    "grunt-contrib-jshint": "^0.11.1",
-    "grunt-contrib-uglify": "^0.9.2",
-    "grunt-contrib-yuidoc": "^0.5.2",
-    "grunt-dox": "~0.5.0",
     "jsdoc": "^3.4.3",
+    "jshint": "^2.9.4",
     "mocha": "^3.2.0",
     "nodemon": "^1.11.0",
     "webpack": "^1.14.0",
@@ -32,7 +25,8 @@
     "start": "webpack-dev-server --config webpack.test.config.js",
     "test": "mocha ./node_modules/babel-core/register.js test/index.js",
     "test:watch": "nodemon --exec \"npm test\" --watch src --watch test",
-    "doc": "jsdoc -c .jsdoc src/*.js"
+    "doc": "jsdoc -c .jsdoc src/*.js",
+    "lint": "jshint src"
   },
   "contributors": [
     {