Merge branch 'release-v0.7.1' of github.com:matrix-org/synapse

CHANGES.rst

contrib/graph/graph2.py

synapse/__init__.py

synapse/api/auth.py

synapse/api/constants.py

synapse/api/errors.py

synapse/api/urls.py

synapse/app/homeserver.py

synapse/app/synctl.py

synapse/appservice/__init__.py

synapse/appservice/api.py

synapse/crypto/keyring.py

synapse/federation/federation_client.py

synapse/federation/federation_server.py

synapse/federation/transaction_queue.py

synapse/handlers/__init__.py

synapse/handlers/appservice.py

synapse/handlers/directory.py

synapse/handlers/federation.py

synapse/handlers/login.py