Evolution of push rules

Add more server default rules so we have default rules for whether you get notifs for invites / random member events

Don't look for a TLS private key if we have set --no-tls

Add some randomness to the user specified timeout on event streams to mi...

Add the highlight tweak where messages should be highlighted a different colour in appropriate clients.

Add some randomness to the user specified timeout on event streams to mitigate against thundering herds problems

Handle if get_missing_pdu returns 400 or not all events.

Slightly reduce the insane amounts of indentation in main http server response path, by 'continue'ing around a non-match or falling through

Conflicts:
	synapse/storage/schema/pusher.sql

Schema versioning

Twisted adbapi wrapped connections aren't context managers.