Revert "devilry_header: Removed the ExtJS app."

This reverts commit 3cc73949eec8c9fcf23bbd88aced5cdff9438e60.
Revert "devilry_header: Removed the old header app view."

This reverts commit 41e60295e7b3f411ce4adb32da020991ae85dcd6.
devilry_header: Reverted:

	commit c035b277de33156d3d249109ba68f292143e4a4d
	Author: Espen Angell Kristiansen <post@espenak.net>
	Date:   Tue Apr 22 17:06:13 2014 +0200

	    devilry_header: Removed the old header view.