Summary:
- Make some editing operations transaction-oriented, like Maniphest. (This
seems to be a good model, particularly for extensibility.) I'll move the rest of
the editing operations to transactions in future diffs.
- Make transaction-oriented operations publish feed stories.
Test Plan:
- Created a new project.
- Edited an existing project.
- Created a new project via quick create flow from Maniphest.
- Verified feed stories publish correctly.
Reviewers: btrahan, jungejason
Reviewed By: btrahan
CC: aran, epriestley
Maniphest Tasks: T681
Differential Revision: https://secure.phabricator.com/D1477
