Add gems for JSON API.
Enable auth key authentication.
Implement base controller and add basic accounts API endpoint.
Test staging instead of tenancy branch on travis.
Add api branch to travis.
Use ensure_authentication_token, not reset_... as devise hook in User.
Prepare for api_taster API docs.
Add some more serializers for (Bank)Accounts.
Drop unused comments in api controller spec.
Add Api Taster.