Refined unit test for FeedsController.
When reading a feed the unread entries count is returned and updated in the view, as well as the entries themselves.
Adapted the "show unread entries" functionality to angularjs.

Fixed a bug in FeedsController#show which returned all entries (read and unread) if the "include_read" GET parameter was present, regardless of its value. The correct behavior is to return all entries only if "include_read=true", and return only unread entries otherwise.
Deleted unused coffeescript file. All its code has now been migrated to angularJS.
If several entries have the same published_date, order them by ther numeric ids.

By default angularJS orders the ids considering them strings. This commit changes this behavior so that they are ordered as integers.