BENTO-17. Reorganize upgrade checkin into a submodule.

Converts this to a multi-module build and moves
the checkin logic into the bento-checkin submodule.

Signed-off-by: Aaron Kimball <aaron@wibidata.com>
Update properties for release.
[maven-release-plugin] prepare release kiji-bento-root-1.0.0-rc5
[maven-release-plugin] prepare for next development iteration
Update versions for development.
Fix parent pom versions.
Add REVIEWERS file.
Use new kiji-mapreduce-lib distribution tar.gz.

Also include KijiMR and KijiMR Lib release notes.

r: lsheng