Added working acceptance test for e9e47f1ccf76efd96b71b1300b77a27155f9edf3

Warden test helpers have been included in Rspec tests. Currently only the logout helper is used, but it's entirely possible that in the future the login_as helper could be used to cut down setup time during acceptance testing. For more about Warden test helpers see Warden wiki:

  https://github.com/hassox/warden/wiki/Testing