Merge branch 'release-v0.8.1' of github.com:matrix-org/synapse

CHANGES.rst

README.rst

contrib/vertobot/bot.pl

contrib/vertobot/bridge.pl

register_new_matrix_user

setup.py

synapse/__init__.py

synapse/api/auth.py

synapse/api/constants.py

synapse/app/homeserver.py

synapse/config/homeserver.py

synapse/config/metrics.py

synapse/config/registration.py

synapse/config/server.py

synapse/events/snapshot.py

synapse/federation/federation_client.py

synapse/federation/federation_server.py

synapse/federation/transaction_queue.py

synapse/federation/transport/server.py

synapse/handlers/_base.py