Diffusion: rough cut of history view

Summary:
Very very rough approximation of history view. I left out all the
log parsing stuff for now since we should be able to just look it up in
a Repository table and I think that'll be a bit faster, although we can
muck around and see.

Test Plan:
Looked at history of a path

Reviewed By: jwilson
Reviewers: aran, jwilson
CC: epriestley, jwilson
Differential Revision: 66

src/applications/diffusion/controller/base/DiffusionController.php

@@ -18,6 +18,18 @@
 
 abstract class DiffusionController extends PhabricatorController {
 
+  protected $diffusionRequest;
+
+  public function willProcessRequest(array $data) {
+    $this->diffusionRequest = DiffusionRequest::newFromAphrontRequestDictionary(
+      $data);
+  }
+
+  public function setDiffusionRequest(DiffusionRequest $request) {
+    $this->diffusionRequest = $request;
+    return $this;
+  }
+
   public function buildStandardPageResponse($view, array $data) {
 
     $page = $this->buildStandardPageView();