Fix automatic refresh for forums and bookmarks.

I guess AFNetworking 2.2.0 needs us to start monitoring reachability.
Merge remote-tracking branch 'origin/master'
Fix crash showing theme picker on iPad.

Still need -preferredContentSize for popovers!
Add title atop page settings.
Reimplement jump to page sheet as semi-modal view controller.

* This is only ever used with a posts view, so ditch the delegate stuff and
  just twiddle the posts view.
Delete WYPopoverController and posts view dead code.

* Posts view still implemented now-irrelevant delegate methods.
Fix going to unread/last page of a thread with nonstandard "posts per page" setting.
Tag commented workarounds for Forums weirdness.