Update bundling scheme

This commit sets things up to work properly when
publishing to npm.  Prior to publishing the package
items from the src/ folder will be processed with Babel
and stored in the lib/ folder. The lib/ folder will
not be present in the repository.  The src/ folder similarly
will not be available when looking at the installed package.

In addition this commit also fixes #332 by adding the
`babel-plugin-transform-object-assign` plugin and removing
`lodash.assign`

.babelrc

@@ -1,3 +1,4 @@
 {
-  "presets": ["react", "latest", "stage-2"]
+  "presets": ["react", "latest", "stage-2"],
+  "plugins": ["babel-plugin-transform-object-assign"]
 }

.gitignore

@@ -3,3 +3,4 @@ node_modules/
 .idea/
 _book
 coverage
+lib

.npmignore

@@ -5,3 +5,4 @@ karma.conf.js
 script
 specs
 .idea/
+src

package.json

@@ -23,16 +23,19 @@
     "docs:build": "gitbook build -g reactjs/react-modal",
     "docs:build:watch": "gitbook serve",
     "docs:publish": "cd _book && git init && git commit --allow-empty -m 'update book' && git checkout -b gh-pages && touch .nojekyll && git add . && git commit -am 'update book' && git push git@github.com:reactjs/react-modal gh-pages --force",
-    "lint": "eslint lib/ specs/"
+    "lint": "eslint lib/ specs/",
+    "prepublish": "babel src -d lib"
   },
   "authors": [
     "Ryan Florence"
   ],
   "license": "MIT",
   "devDependencies": {
+    "babel-cli": "^6.23.0",
     "babel-core": "^6.7.4",
     "babel-eslint": "^7.1.1",
     "babel-loader": "^6.2.4",
+    "babel-plugin-transform-object-assign": "^6.22.0",
     "babel-preset-es2015": "^6.6.0",
     "babel-preset-latest": "^6.16.0",
     "babel-preset-react": "^6.5.0",
@@ -72,8 +75,7 @@
   },
   "dependencies": {
     "element-class": "^0.2.0",
-    "exenv": "1.2.0",
-    "lodash.assign": "^4.2.0"
+    "exenv": "1.2.0"
   },
   "peerDependencies": {
     "react": "^0.14.0 || ^15.0.0",

lib/components/ModalPortal.js → src/components/ModalPortal.js

@@ -1,5 +1,4 @@
 import React, { Component, PropTypes } from 'react';
-import Assign from 'lodash.assign';
 import scopeTab from '../helpers/scopeTab';
 import {
   returnFocus,
@@ -211,12 +210,12 @@ export default class ModalPortal extends Component {
       <div
         ref={(c) => { this.overlay = c; }}
         className={this.buildClassName('overlay', this.props.overlayClassName)}
-        style={Assign({}, overlayStyles, this.props.style.overlay || {})}
+        style={Object.assign({}, overlayStyles, this.props.style.overlay || {})}
         onClick={this.handleOverlayOnClick}
       >
         <div
           ref={(c) => { this.content = c; }}
-          style={Assign({}, contentStyles, this.props.style.content || {})}
+          style={Object.assign({}, contentStyles, this.props.style.content || {})}
           className={this.buildClassName('content', this.props.className)}
           tabIndex={-1}
           onKeyDown={this.handleKeyDown}