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
Removed comments
Comments about package name and content provider authorities