Cleanup JS

* Make it abide by MW's jshint & better abide coding standards
  * Declare vars first
  * Check identity instead of equality
* Map mw to mediaWiki
* Removed calls to unexisting $.aftTrack.prefix()
* Updated watchlist link to match article & talk page link
* Removed empty .ie.js file
* Removed deprecated $.aftTrack.removeLegacyCookies()

Change-Id: I64556d249b56a539840ded963f91ffc474bf2a57

Conflicts:
	modules/ext.articleFeedbackv5/ext.articleFeedbackv5.startup.js
	modules/ext.articleFeedbackv5/ext.articleFeedbackv5.watchlist.js
	modules/jquery.articleFeedbackv5/jquery.articleFeedbackv5.js
	modules/jquery.articleFeedbackv5/jquery.articleFeedbackv5.special.js
	modules/jquery.articleFeedbackv5/jquery.articleFeedbackv5.utils.js