Bugfix

- Fix bug reported via Developer console
- Bump target to 4.3
- Updated gitignore.
Null pointer exception

- Bugfix for another Developer console reported error
New suggested features implemented, and moar uniformity.

- Convert old preferences to new
- Make dnd preferences uniform with the others (or should I say made the
other uniform with the dnd preferences)
- Add quiet hours as per issue #8
- Add confirmation dialog from issue #10
- Add clicking on the accessibility error in the main activity and being
pushed to the accessibility settings. issue #5