view spec fixes for rails 3

* fix view spec rendering to include helpers
* re-implement have_tag rspec matcher
* fix problems with finding routes to
 unsaved records

Change-Id: I6ed267fcf5e8e32a62ee059be46371bc0ea35603
Reviewed-on: https://gerrit.instructure.com/30016
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>
QA-Review: James Williams  <jamesw@instructure.com>