Update omniauth and omniauth-cas gems
Update inherited_resources gem to 1.4.0

As of 1.4.0, inherited_resources now memoizes some things in its own
internal structures. For instance it caches the built version of the
params hash, which prevents from having two requests in the same test.
That's fine because it calls out more focused tests, so I prefer fixing
tests than fixing inherited_resources.