Remove auth module and config
Add plugins loading code based on PingApp
Add DataProvider module and SMSSync provider

- Add the DataProvider module, this is based of the Ping SMS Provider but
refactored to be a little more reusable.
- Ushahidi_DataProvider extends Data Provider and implents functions
to save / get messages
- Add Message, DataFeed and Contact models
- Routes may not be quite right yet.
Add messages API and tests
Fixing error for unq_email when downgrading db
Fix db migration down() for message, contacts, data_feeds tables
Better handling of Exceptions when running at CLI

Just return exception text, not HTML when we're at the CLI