This adds rest endpoints for schema, group, account listing and individual item getting, client lib to call these end points, and tests for all of these.
Partially Implements #6 - add ability for accounts to self set password. This is good for now, as I get closer to a trial radius deployment, but I think I'm finding the rest api probably needs a better plan at this point, as well as probably the way we do the proto and the communication needs some more thoughts too.
This adds the fundamentals of the basic IDM layout. It contains the needed design document, and is designed such that the default admins while powerful, still have some limits upon them.
