CacheWord/LockScreen work

Broke out lock screen logic into "LockableActivity" and extend from
that. Implement passphrase timeout in settings GUI.
Settings from securereaderlibrary
Merge branch 'master' of https://github.com/guardianproject/securereader
Merge pull request #9 from N-Pex/master_npex

CacheWord/LockScreen work
Merge remote-tracking branch 'upstream/master' into paik

Conflicts:
	app/src/info/guardianproject/securereaderinterface/FragmentActivityWithMenu.java
Merge pull request #11 from N-Pex/paik

Merging latest from master.