Provider a simpler interface

[iaincollins]

While this library does a lot of heavy lifting, it's still complicated to follow as there are several instructions. It would be better if it provided common functionality with as little configuration out of the box as possible.

I might bundle build in helpers for it, so it's easy to use with common oAuth providers and Mongo DB out of the box, just by passing oAuth Credentials for the providers and a Mongo DB URI, so that no other configuration is required (but can still be specified if desired).

[iaincollins]

While it's still seeing improvements, the API for 1.x is not likely to change any breaking way now.

Any major changes are likely to be rolled into 2.0. See issue #14 for details.