Update the Review Board webapi codebase for the new Djblets updates.

Review Request #7478 — Created July 2, 2015 and submitted — Latest diff uploaded

Information

Review Board
master
9d3e4af...

Reviewers

A lot of the base API code living in Review Board just moved into
Djblets. This change updates Review Board to make use of the new code in
Djblets, reducing the size of the Review Board API codebase.

Unit tests pass.