start for kratos

initial models; initial json output used by angular branch; very early code. 
User here is a string. Unfortunately, you can't get the User model before models are loaded. Thus pulling the string from settings.py, and the special case where I get the actual User class within that one method that needs it. I could call this something else - UserModelString? but that seams a bit clunky. Any other ideas that are both clearer and succinct?