Revert "Revert to Lodash v3 which never overwrites globals."

This reverts commit ff3ebec.

Only Lodash v4's main export breaks when in browsers. Just need to avoid
that there.

inc/index.js

@@ -2,14 +2,14 @@
 
 var has = require('../lib/has');
 var StrSet = require('../lib/str-set');
-var forEach = require('lodash/collection/forEach');
-var some = require('lodash/collection/some');
-var map = require('lodash/collection/map');
-var filter = require('lodash/collection/filter');
-var zipObject = require('lodash/array/zipObject');
-var forOwn = require('lodash/object/forOwn');
-var mapValues = require('lodash/object/mapValues');
-var assign = require('lodash/object/assign');
+var forEach = require('lodash/forEach');
+var some = require('lodash/some');
+var map = require('lodash/map');
+var filter = require('lodash/filter');
+var zipObject = require('lodash/zipObject');
+var forOwn = require('lodash/forOwn');
+var mapValues = require('lodash/mapValues');
+var assign = require('lodash/assign');
 
 function emitError(err) {
   setTimeout(function() {

package.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "convert-source-map": "^1.1.1",
     "express": "^4.13.3",
-    "lodash": "^3.10.1",
+    "lodash": "^4.0.0",
     "rsvp": "^3.0.21",
     "socket.io": "^1.3.7",
     "socket.io-client": "^1.3.7",