Summary:
- We currently post-filter by branches, but should do this in SQL. See T799.
- We currently identify branch-name-matches as being in the working copy even if they belong to a different project (e.g., two different projects with commits on the branch "master"). See T1100.
- Denormalize branch and project information into DifferentialRevision.
- Expose project information in the API.
Test Plan: Ran conduit API queries with branches and arc project IDs, got reasonable results.
Reviewers: btrahan, vrana, jungejason
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T1100, T799
Differential Revision: https://secure.phabricator.com/D2190
