Removed old translations
Upgraded gradle wrapper and build tools
Use our own, backwards-compatible version of the FloatingActionBar library
New Gradle Witness build

Includes a fix for Gradle 2.+ that is not yet pulled in:
https://github.com/WhisperSystems/gradle-witness/pull/3
Upgraded build tools to 21.0.0 (needed to fix a resource merging bug)
Upgraded build tools to 21.0.2 (fixes a compile bug)