Fix FC while rotating layout during sync.
Partial impl. of circular progress overlay widget.
Visual styling of overlay progress ring. Tap-to-toast for same.
Full find-unread or go-home functionality for overlay nav right button.
Overlay nav "back" button with history support.
Enable overlay nav support for folders.
Fix FC on overlay button enable.
Merge remote-tracking branch 'upstream/master'
Fix FC on unread-search error.
Add left-hand set of overlay buttons.
Fix double-load of reading views.
Push overlay buttons into overflow if there isn't enough screen space.
Remove pre-3.0 alpha hack so buttons don't go missing.
Merge pull request #425 from dosiecki/master

Android: Overlay Navigation