Reactivate infiniteScroll on like action

* Remove AppController.showInfiniteScrollEnd() and .hideInfiniteScrollEnd() 'cause they're redundant
Merge branch 'purge' into prevent_duplicate_likes

Conflicts:
	app/assets/javascripts/app_controller.js
Merge pull request #55 from ShopIt2Me/prevent_duplicate_likes

Reactivate infiniteScroll on like action