ca: create script to cURL Kinvey REST API
ca: configure httpProvider for cross-origin requests
ca: add User resource
ca: inject http & User into Authentication service
ca: authenticate using resource
ca: call authenticate/unauthenticate from signin/signout button clicks
ca: add success/error handlers
ca: authenticate using form values and handle success/error appropriately
ca: tweak définition of awry
ca: set awry in controller success/error handlers
ca: redirect to home following successful signin/signout