api docs: Finished adding all C-S APIs. Added initialSync, publicRooms, membership changes (generic and RPCy) and directory paths.

Conflicts:
	synapse/handlers/events.py
	synapse/rest/events.py
	synapse/rest/room.py

A reliable logger.info() message /after/ the TCP port has been opened and is listening; this is essential for avoiding races in wrapper scripts e.g. integration testing

Removed urls.rst - The API docs / swagger JSON should be used as the canonical source for the REST API. Keeping urls.rst around is just an extra maintenance burden.