Allow CelerityResourceResponse to hold resources from multiple maps

Summary:
Ref T4222. Currently, CelerityResourceResponse holds response resources in flat maps. Instead, specify which map resources appear in.

Also, provide `requireResource()` and `initBehavior()` APIs on the Controller and View base classes. These provide a cleaner abstraction over `require_celerity_resource()` and `Javelin::initBehavior()`, but are otherwise the same. Move a few callsites over.

Test Plan:
  - Reloaded pages.
  - Browsed around Differential.

Reviewers: btrahan, hach-que

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4222

Differential Revision: https://secure.phabricator.com/D7876

src/applications/base/controller/PhabricatorController.php

@@ -408,4 +408,9 @@ abstract class PhabricatorController extends AphrontController {
     return array($can_act, $message);
   }
 
+  public function getDefaultResourceSource() {
+    return 'phabricator';
+  }
+
+
 }