Summary: Ref T4195. Adds support for diff content rules.
Test Plan: Pushed SVN and Git changes through, saw them generate reasonable transcripts. Mercurial still isn't hooked up to this phase.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T4195
Differential Revision: https://secure.phabricator.com/D7791
Summary: Ref T4195. This doesn't provide any interesting fields yet (content, affected paths, commit message) but fires the hook correctly.
Test Plan: Added a blocking hook and saw it fire.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T4195
Differential Revision: https://secure.phabricator.com/D7789