finish integrating npm. move underscore/backbone into npm management

app/assets/javascripts/application.js

@@ -13,8 +13,7 @@
 //= require jquery
 //= require jquery-ui
 //= require jquery_ujs
-//= require ./orderedLibraries/underscore
-//= require ./orderedLibraries/backbone
+//= require ./webpacked/metamaps.bundle
 //= require_directory ./lib
 //= require ./src/Metamaps.GlobalUI
 //= require ./src/Metamaps.Router

frontend/package.json

@@ -25,11 +25,13 @@
     "babel-preset-react": "^6.11.1",
     "chai": "^3.5.0",
     "mocha": "^2.4.5",
-    "path": "^0.12.7",
     "webpack": "^1.13.1"
   },
   "dependencies": {
+    "backbone": "^1.0.0",
     "react": "^15.3.0",
-    "react-dom": "^15.3.0"
+    "react-dom": "^15.3.0",
+    "requirejs": "^2.1.1",
+    "underscore": "^1.8.3"
   }
 }

frontend/src/index.js

@@ -1,11 +1,15 @@
 import React from 'react'
 import ReactDOM from 'react-dom'
-import ExploreHeader from './components/ExploreHeader.js'
+import Backbone from 'backbone'
+import _ from 'underscore'
+import ExploreHeader from './components/ExploreHeader'
 
 // this is optional really, if we import components directly React will be 
 // in the bundle, so we won't need a global reference
 window.React = React
 window.ReactDOM = ReactDOM
+window.Backbone = Backbone
+window._ = _
 
 window.Metamaps = window.Metamaps || {}
 window.Metamaps.ReactComponents = {