CON-1379: Added Handlebar Engine
CON-1379: Support handlebars partials
CON-1379: Support for handlebars js
CON-1379 add handlebars service

Conflicts:
	extensions/wikia/VenusTest/VenusTestController.class.php
	includes/wikia/nirvana/WikiaView.class.php
	includes/wikia/template/HandlebarsEngine.class.php
CON-1379 | Cleanup, changes after CR
Fix loadHandlebars
CON-1379 | Fixes after CR
CON-1379 | CR changes II
Update config.php

Comment handlebars.js (for now) and add comment with description.
CON-1379 | Handlebars fixes
CON-1379 | Handlebars fixes
Merge pull request #4310 from Wikia/CON-1379-handlebars-engine

CON-1379: handlebars engine