Enter Password module working with server mockup.
Merge pull request #24 from borjasalguero/fxa_proposal_enter_password

Enter Password module working with server mockup.

I am going to merge this now, the requested changes can be made in subsequent PRs.

r+
Hook up the reset password link to be processed.

* Backend is faked for now, needs hooked up to IAC client.
* An error screen is displayed if fake backend request fails.
* setState has been added to fxam_states.js which allows "out of band" state changes.
* Added new strings which use the naming convention in PR #22