Version 2.2, release 56
Issue #396: Code formatting
Closes #434
Action bar style fixes

Alpha for actionbar overflow icon now matches other actionbar icons.
Fixes #437

Replaced actionbar gradient background with solid grey (darker grey
bottom border)
Created borderless button style and vertical divider style for actionbar
buttons.
Replaced filter icon with slightly larger, flat version.
Fixes #436
Delete FilterActivity (no longer used)
Update name of the app in license header
Update license header
* Change app name to Todo.txt for Android
* Include GitHub URL in license text header
* Add missing docblocks to .java and .xml files
Closes #430