Implements Client Management Endpoints

We already had the R of CRUD, this adds the other 3. The 3 new endpoints require an oauth token with the scope `oauth`. Yo dawg, I heard you like oauth?

@rfk r?
@vladikoff you should take a look and see if there's something I've forgotten that the console will need.

fixes #60 
Yea, that happens inside hapi: https://github.com/hapijs/hapi/blob/master/lib/auth.js#L270

Wrong scope = Boom.forbidden()