Parse theme from querystring, put on util. Moment from require()

We also fully set up i18n and put it on util as well as making
it available on windows.i18n for Backbone views.

styleguide.config.js

@@ -44,9 +44,6 @@ module.exports = {
         {
           src: 'test/legacy_bridge.js',
         },
-        {
-          src: 'node_modules/moment/min/moment-with-locales.min.js',
-        },
         {
           src: 'js/components.js',
         },