Add Parse API keys and initialization.

Please see IntlChat->Build Phases->Run Script for script that does updating.

Expects keys to be stored in ~/.api_keys in format described
Stopping for night.  Signup and login working except for stubbed language selector.

Refactoring signup page to make it work properly and tying into parse signup flow.
changes to ui
Merge pull request #2 from osabina/models

Models
change password field