Merge pull request #741 from negzi/create_user_with_expiry

synapse/api/auth.py

synapse/config/key.py

synapse/config/registration.py

synapse/handlers/auth.py

synapse/handlers/register.py

synapse/rest/client/v1/register.py

tests/api/test_auth.py

tests/handlers/test_register.py

tests/rest/client/v1/test_register.py

tests/utils.py