Conpherence V1

Summary: it's ugly. but it works. basically. See T2399 for a roughly prioritized list of what still needs to happen.

Test Plan:
- created a conpherence with myself from my profile
- created a conpherence with myself from "new conpherence"
- created a conphernece with another from "new conpherence"
- created a conpherence with several others
- created a conpherence with files in the initial post
 - verified files via comment text ("{F232} is awesome!") and via traditional attach
- edited a conpherence image
 - verified it showed up in the header and in the conpherence menu on the left
- edited a conpherence title
 - verified it showed up in the header and in the conpherence menu on the right
- verified each widget showed up when clicked and displayed the proper data
 - calendar being an exception since it sucks so hard right now.

Reviewers: epriestley, chad

Reviewed By: epriestley

CC: aran, epriestley, chad, codeblock, Korvin

Maniphest Tasks: T2301

Differential Revision: https://secure.phabricator.com/D4620