Check that something has happend before running the selects

Optionally daemonize the pusher

Make pyjwt dependency optional

Add a couple of update methods to the PusherSlaveStore

Add a metrics listener and a ssh listener to the pusher

Split out setting up the manhole to a separate file

Move SynapseSite to its own file

Conflicts:
	synapse/app/homeserver.py

Split out create_resource_tree to a separate file

Optionally split out the pushers into a separate process

Optimise event_search in postgres

Fix issues with JWT login

Replicate the pushers

Add a replication endpoint for deleting pushers