Enforce available locales to get rid of rails warning.
renamed methods to describe their purpose.
Registrations controller now responds only to json.
removed rspec/autorun so zeus doesn't run specs twice.
Some tweaks:
     - Registrations spec cleanup;
     - Token authentication doesn't require email anymore.
Now using custom routing (instead of Devise routing).
Added sessions controller.
Added update_location action to registrations controller.
Devise now signs User out before deleting it.