Updates, fixes - request to maintain

Hi,

Thanks very much for the package, it's just what I need for my current project. In order to use it in my application I had to make a few changes and additions. I then went a bit further, refactoring, extending, using rather then duplicating `Network.OAuth.OAuth2`, etc.

I would love to take over as maintainer of this package and post it to Hackage. If not, please consider merging these changes and releasing the package.

Let me know your thoughts.