Conpherence - make conpherence load the bare minimum of data

Summary: also re-enables the updating of the widgets and "cleans up" the javascript a tad. Ref T2867

Test Plan: all sorts of conpherence fun like adding people to threads, adding files, pontificating, etc

Reviewers: epriestley, chad

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2867

Differential Revision: https://secure.phabricator.com/D5595