v3.4.1

Updated for latest ldap3 package (#64)
Per-SP configuration for LDAP attribute store microservice (#60)
Added __repr__ method to class State to aid debugging (#59)
Added __repr__ method to class Context to aid debugging (#58)
Thanks to @skoranda.

Fix facebook backend metadata bug (#63)
Thanks to @saxtouri

Remove explicit pyoidc dependency to avoid collision with pyop (#57)
Thanks to @zamzterz