Update to Guava 16.0.1.
Downgrade severity of 'MissingTranslation' errors to "warning".

This was preventing release builds from completing successfully.
Prepare to release 1.0.2-beta-1.

Add appropriate release notes.
Update infrastructure versions:

- Gradle:  0.9 -> 1.12.
- Build tools: 19.0.0 -> 19.1.0
Prepare for release 1.0.2.
Merge branch 'release-1.0.2' into develop