REBASE move action contants into GpgApplication, stop using Apg constants
REBASE separate BaseAdapters for public keys from Contacts and secret from GnuPG
REWORD set periodic Contacts sync to happen every 72 hours automatically
convert KeyListFragment to plain ListFragment style

The ListFragment has lots of sensible defaults that we want to use, and
they making adding things like live search filters much easier.  In this
case, its actually using SherlockListFragment since Sherlock is used
elsewhere.  If we rip out ActionBarSherlock, then this should work fine
just switching everything to the Android Support versions.

refs #1633, #2681, #1467