Add translations to Karma specs

* Added a task to Gruntfile to use website/src/i18n.js to generate a small JS file to be loaded in Karma env which sets window.env.translations to the i18n.translations['en'].

* Added new Grunt task to build:dev

* Updated Karma specs to reenable testing where possible, updating comments where not.

test/spec/filtersCtrlSpec.js

@@ -3,7 +3,6 @@
 describe('Filters Controller', function() {
   var scope, user;
 
-  beforeEach(module('habitrpg'));
   beforeEach(inject(function($rootScope, $controller, Shared) {
     user = specHelper.newUser();
     Shared.wrap(user);