Marked feed and folder titles returned by RESTful actions as html-safe.

This avoids special characters like apostrophes being escaped and displayed incorrectly on the page.
WIP: migration to angularjs.

Removed some jquery event handlers which are no longer necessary.

When a subscription to a feed is added, the feed is automatically selected. This does not yet load this feed's entries, but it will in the future.
Show a "loading.." message while a new subscription is being loaded. After adding a subscription update the unread entries count.
Removed unused coffeescript file. Navbar buttons are hidden or disabled (depending which button) while a feed's entries are loading.