Install Rails security update for CVE-2013-0156

See URL for more details

https://groups.google.com/forum/#!topic/rubyonrails-security/61bkgvnSGTQ/discussion
Follow our Gemfile styleguide
Revert "Merge pull request #103 from alphagov/loan-guarantee-flow-changes"

This reverts commit 3f2e0544491faecc557046fa1727a4e4959e3725, reversing
changes made to b89853fe03e96fff69a389a26f7b025fc4fc598d.
Merge branch 'master' into dependency-updates

Conflicts:
	Gemfile.lock