kiji-bento: BENTO-47. Incorporate the Kiji model repository with BentoBox

issue: https://jira.kiji.org/browse/BENTO-47
review: https://review.kiji.org/r/1316
commit: https://github.com/kijiproject/kiji-bento/commit/11992cc4ac1890c3920bf1ce8a25700ee634c299