R1:21ac19630613

Modernize PhameBlog with modular transactions

Summary: Moves PhameBlog over to the wonderful world of modular transactions and the riches that lay beyond...

Test Plan:
- Create Blog
- Edit Blog
- Set Header
- Delete Header
- Add picture
- Archive blog
- Set incorrect domain values
- Be irresponsible with subtitle length
- Activate blog
- Change description

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17815