Tests
Merge pull request #38 from ferjm/fxa_proposal_complete

Fixed FxAccountsIACHelper tests and adds FxAccountsManager tests
closing transition for fxa
Merge pull request #39 from OlavHN/fxa-close-transition

closing transition for fxa
Hook up to the FxA client!

* Start to hook up error screens based on responses.
* Rename FxModuleServerRequest->checkPassword to signIn, and createAccount->signUp