for all pdus sent.

Room initial sync

Split out sending the room alias events from creating the alias so that we can do them in the right point when creating a room

Conflicts:
	synapse/handlers/message.py

Merge pdu and event objects

do *not* depend on external websites to host our JS - if nothing else, it makes hacking on synapse when offline (e.g. on planes) a huge PITA :(