Update Rails to 4.0.8, fix CVE-2014-3483.
Also had to update sass-rails and bourbon because of Asset pipeline
related error `undefined method `environment' for nil:NilClass`
Merge branch 'master' into bt-78-update-rails-4-0-8

Conflicts:
	Gemfile.lock
Merge pull request #80 from benichu/bt-78-update-rails-4-0-8

Update Rails to 4.0.8, fix CVE-2014-3483.