Add str and unicode overrides for college

Signed-off-by: Sam Phippen <samphippen@googlemail.com>
Make getting a user work with get requests also

Signed-off-by: Sam Phippen <samphippen@googlemail.com>
Add is authenticated methods to all user objects

Signed-off-by: Sam Phippen <samphippen@googlemail.com>
Add empty colleges property to nulluser

Signed-off-by: Sam Phippen <samphippen@googlemail.com>
Add details dictionary method to user for nemesis web

Signed-off-by: Sam Phippen <samphippen@googlemail.com>