Merge pull request #35 from matrix-org/pushers2

contrib/jitsimeetbridge/jitsimeetbridge.py

synapse/api/errors.py

synapse/app/homeserver.py

synapse/handlers/events.py

synapse/handlers/presence.py

synapse/http/client.py

synapse/http/server.py

synapse/push/__init__.py

synapse/push/httppusher.py

synapse/push/pusherpool.py

synapse/rest/__init__.py

synapse/rest/client/v1/__init__.py

synapse/rest/client/v1/push_rule.py

synapse/rest/client/v1/pusher.py

synapse/server.py

synapse/storage/__init__.py

synapse/storage/_base.py

synapse/storage/push_rule.py

synapse/storage/pusher.py

synapse/storage/schema/delta/v10.sql