Merge branch 'develop' into server2server_tls

docs/client-server/swagger_matrix/rooms

docs/specification.rst

jsfiddles/create_room_send_msg/demo.js

jsfiddles/event_stream/demo.js

jsfiddles/example_app/demo.js

jsfiddles/register_login/demo.js

jsfiddles/room_memberships/demo.html

jsfiddles/room_memberships/demo.js

synapse/app/homeserver.py

synapse/config/__init__.py

synapse/config/_base.py

synapse/config/database.py

synapse/config/homeserver.py

synapse/config/logger.py

synapse/config/server.py

synapse/config/tls.py

synapse/crypto/config.py

synapse/federation/replication.py

synapse/handlers/events.py

synapse/handlers/federation.py