Merge branch 'release-v0.9.1' of github.com:matrix-org/synapse

CHANGES.rst

README.rst

demo/start.sh

scripts-dev/convert_server_keys.py

scripts/register_new_matrix_user

synapse/__init__.py

synapse/app/homeserver.py

synapse/appservice/__init__.py

synapse/config/metrics.py

synapse/crypto/keyclient.py

synapse/crypto/keyring.py

synapse/federation/federation_base.py

synapse/federation/federation_client.py

synapse/federation/federation_server.py

synapse/federation/transaction_queue.py

synapse/federation/transport/client.py

synapse/federation/transport/server.py

synapse/handlers/_base.py

synapse/handlers/appservice.py

synapse/handlers/directory.py