First cut of new Project Home

Summary:
First pass at a new Project Home page. This is starting to sprawl, so punting this up now before it gets too large.

• Project homes now have "large header"
• Custom Fields / Descriptions are in the main column
• Feed is simpler visually
• new "Background" option for PHUIObjectBoxView
• move header buttons globally to "Grey" instead of "Simple"
• New color and hover states for "Grey"
• Transitions on Buttons haha
• Edit Icon on Nav is now under "Manage" panel
• New "Manage" Panel

TODO:

• More testing of bad cases of Custom Fields
• Members Page in flux, needs design
• Um still not sure how to make Custom Field not show UI

Test Plan:
Lots of random Project page visits. Save project, watch project, edit project, etc.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D15097