Serve admin and admin urls properly

*479ddf65256d6ee3702e9a97de8ab1fb2643a48d

Was raising error "'AdminSite' object has no attribute 'root'" . Fix for it.

*22768b5a4b5c2485e307cb4ea245fb8879709cb0

Admin urls were not being served, eg http://127.0.0.1:8000/admin/auth/user/. Fix for it.

*4941253c5191e48dc75d7249586d9c6c85f161d2

Not required if check in clean_openid_identifier(). Removed it.