Mitigate Rails vulnerability (CVE-2013-0156)

Here we apply the workaround suggested here:
  https://groups.google.com/forum/#!topic/rubyonrails-security/61bkgvnSGTQ/discussion

Change-Id: I9972190848445cea0066388b648e924e73c60435
Reviewed-on: https://gerrit.causes.com/17272
Reviewed-by: Noah Silas <noah@causes.com>
Tested-by: Lann Martin <lann@causes.com>