Bug 1035646 - [Collection App] Drag icons over edit header like vertical home
Bug 1027250 - [Rocketbar] Search suggestions in the Homescreen settings is not consistent with the rest of the UI
Bug 1023087 - [Window Management] Marionette test for copy-paste
Bug 1033403 - [Messages] We don't stop rendering if we tap "back" too soon r=azasypkin

* moves the moment "initializeRendering" is called: in beforeEnter instead of
afterEnter.
* calls MessageManager.markThreadRead in afterEnterThread
* removes the 'done' handler in renderMessages because we don't need it now
Merge pull request #20910 from cctuan/1023087

Bug 1023087 - [Window Management] Marionette test for copy-paste
Merge pull request #21516 from crdlc/bug-1027250

Bug 1027250 - [Rocketbar] Search suggestions in the Homescreen settings ...
Merge pull request #21483 from crdlc/bug-1035646

Bug 1035646 - [Collection App] Drag icons over edit header like vertical...
Bug 1036336 - [Collection App] Icons jump after rendering all of them