Look for name, topic in the event content rather than the event itself when persisting room name and topic events

Supply auth_chain along with current state in '/state/', fetch auth events from a remote server if we are missing some of them

Replace distributor deferred list, with a simple for loop until I understand why the former breaks and the latter doesn't

Add gotcha: The content repository requires additional cygwin packages.

Add windows (cygwin) install instructions.

Conflicts:
	synapse/state.py

Remove send_message since nothing was calling it. Remove Snapshot because only send_message was using it

Construct the EventContext in the state handler rather than constructing one and then immediately calling state_handler.annotate_context_with_state