Add default devise_for :user routes but skip them
Rename sessions controller spec description to be 
more specific
… and get rid of the old describe name
Create API::V1::SessionsController
Change expectations of API::V1::SessionsController 
POST /sessions success spec
Created create action in API:V1:SessionsController,
spec test passing
Create Sessions API "POST /sessions" failure test
Created failure action in
API:V1:SessionsController, spec test passing