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

src/applications/conpherence/controller/ConpherenceController.php

@@ -46,7 +46,7 @@ abstract class ConpherenceController extends PhabricatorController {
     $all_conpherences = id(new ConpherenceThreadQuery())
       ->setViewer($user)
       ->withPHIDs($all_conpherence_phids)
-      ->needAllTransactions(true)
+      ->needParticipantCache(true)
       ->execute();
     $unread_conpherences = array_select_keys(
       $all_conpherences,