Merge pull request #1046 from matrix-org/markjh/direct_to_device

synapse/handlers/sync.py

synapse/rest/__init__.py

synapse/rest/client/v2_alpha/sendtodevice.py

synapse/rest/client/v2_alpha/sync.py

synapse/storage/__init__.py

synapse/storage/deviceinbox.py

synapse/storage/schema/delta/34/device_inbox.sql

synapse/streams/events.py

synapse/types.py

tests/rest/client/v1/test_rooms.py