Add omniauth gems.
Added twitter authentication that is fully integrated with devise.
Add error handles to devise config for omniauth vars.
Modify devise config to better handle omniauth vars and added test coverage for omniauth methods.
Added omniauth key and secret for test environment to make travis ci happy.
Merge master and fix conflicts.
Merge pull request #21 from CabForward/omniauth-implementation

Omniauth implementation