rails4: silence deprecation warnings in tests

make sure to remove this once we're on rails 4

refs #CNVS-21596

Change-Id: I1b6ddef79ab2bae44a81e3e53112725b9c229aff
Reviewed-on: https://gerrit.instructure.com/59737
Tested-by: Jenkins
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>
QA-Review: James Williams  <jamesw@instructure.com>

spec/spec_helper.rb

@@ -71,6 +71,10 @@ unless CANVAS_RAILS3
     alias_method :compare_without_round, :<=>
     alias_method :<=>, :compare_with_round
   end
+
+  # temporary patch to keep things sane
+  # TODO: actually fix the deprecation messages once we're on Rails 4 permanently and remove this
+  ActiveSupport::Deprecation.silenced = true
 end
 
 module RSpec::Rails