enable colors for rails 3 rspec

Change-Id: I92afbb4182ee3133e0d634ad816a23b4729f5f2c
Reviewed-on: https://gerrit.instructure.com/37228
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Brian Palmer <brianp@instructure.com>
QA-Review: Jeremy Putnam <jeremyp@instructure.com>
Product-Review: Nick Cloward <ncloward@instructure.com>

spec/spec_helper.rb

@@ -31,6 +31,8 @@ unless CANVAS_RAILS2
   end
 
   RSpec.configure do |c|
+    c.color_enabled = true
+
     c.around(:each) do |example|
       attempts = 0
       begin