AJAX calls no longer generate flash messages.
Updated specs.
Merge branch 'master' of github.com:thegarage/prelaunch into fix-controller

Conflicts:
	app/controllers/waitlist/subscribers_controller.rb
	lib/waitlist/version.rb
	spec/controllers/waitlist_subscribers_spec.rb
Merge pull request #6 from thegarage/fix-controller

AJAX calls no longer generate flash messages.