modify diet ember-auth the RSVP.Promise.fail renamed RSVP.Promise.catch

RSVP.Promise.fail has been renamed as RSVP.Promise.catch in ember 1.3.0
modify lib auth.em RSVP's fail to catch
update ember source to 1.3.0
Merge pull request #1 from jebbit/support_ember_1.3.0

Support ember 1.3.0