All room state is currently shared.
Alias lookups return a server list.
Be less alarmist about not using an ID server.
Fix default value and key names.
Don't use spaces in example room alias
m.room.ops_levels includes redact_level
Remove note about assymetry of having left a room.

Currently, if you leave a room you still appear in the members list.
This is basically a bug with the current implementation/spec, rather
than something that should happen.
Remove incorrect reasons for empty PDU lists.
Add todo notes
Merge pull request #4 from matrix-org/erikj-spec-changes

Erikj spec changes