Conform to style guide
Move utils to util, move functions from Apg to util.Utils
Move deleteFileSecurely into BaseActivity
Move some helper functions to Utils
Move org.thialfihar.android.apg.key to *.apg.core

Also move ProgressDialogUpdater there and rename it to Progressable.
Move activities to ui
Latest refactoring changes
Adjust checkstyle to allow single letter methods
refactoring SignEncrypt done
Refactoring
Rename encrypt to encrypt_layout
Move initialization into an Application class
Move KeyServer classes to core
Fix some imports and style
Remove unused MailListActivity
Move HkpKeyServer to core
Refactor passphrase cache service
Distribute some classes to ui and util