Hook up delete button to PublishedEntry's destroy function

We wait for the server to successfully delete the entry, then we remove
it from the DOM.
Make EntriesQueue responsible for filtering entries.

Collections shouldn't modify the DOM, that's the job of views.
Entry fetching timer now uses EntriesQueue's fetch function.

The EntriesQueue is moving towards being able to manage its self, with
regard to its fetch timer.

I've also removed a large chunk of unused code, most of which was
previously handling rendering & ajax calls.