Add very basic scaffolding for Pholio

Summary:
I'm not going to land this until it's a bit more fleshed out since it would just confuse users, but this is probably more reviewable as a few diffs adding a couple features than one ULTRA-diff adding everything. Implement application basics for Pholio. This does more or less nothing, but adds storage, subscribe, flag, markup, indexing, query basics, PHIDs, handle loads, a couple of realy really basic controllers, etc.
Basic hierarchy is:

• Moleskine: Top-level object like a Differential Revision, like "Ponder Feed Ideas".
• Image: Each Moleskine has one or more images, like the unexpanded / expanded / mobile / empty states of feed.
• Transaction: Comment or edit, like Maniphest. I generally want to move most apps to a transaction model so we can log edits.
• PixelComment: Equivalent of an inline comment.

Test Plan: Created a fake object and viewed it.

Reviewers: btrahan, chad

Reviewed By: btrahan

CC: aran, davidreuss

Maniphest Tasks: T2097

Differential Revision: https://secure.phabricator.com/D3817