fix(users): Fixed checking unique user fields against same user.
fix(users): added test for exclude parameter in sdUserUnique directive.
fix(users): fixed tests for sdUserUnique directive.

close #175
fix(users): sync params after saving user to be able to patch it after

When saving we check for href to decide if we should POST or PUT the data.
After POST original data was not updated so it would try to POST again.