client/v1/room: include event_id in response to state event PUT

Signed-off-by: Patrik Oldsberg <patrik.oldsberg@ericsson.com>

Make adding push rules idempotent

Also remove the **kwargs from the add_push_rule method.

Fixes https://matrix.org/jira/browse/SYN-391

Also remove the **kwargs from the add_push_rule method.

Fixes https://matrix.org/jira/browse/SYN-391

Simplify room creation code

This reverts commit cf81375b.

It subtly violates a guest joining auth check

Merge two of the room join codepaths

There's at least one more to merge in.

Side-effects:
 * Stop reporting None as displayname and avatar_url in some cases
 * Joining a room by alias populates guest-ness in join event
 * Remove unspec'd PUT version of /join/<room_id_or_alias> which has not
   been called on matrix.org according to logs
 * Stop recording access_token_id on /join/room_id - currently we don't
   record it on /join/room_alias; I can try to thread it through at some
   point.

There's at least one more to merge in.

Side-effects:
 * Stop reporting None as displayname and avatar_url in some cases
 * Joining a room by alias populates guest-ness in join event
 * Remove unspec'd PUT version of /join/<room_id_or_alias> which has not
   been called on matrix.org according to logs
 * Stop recording access_token_id on /join/room_id - currently we don't
   record it on /join/room_alias; I can try to thread it through at some
   point.

Catch the exceptions thrown by twisted when you write to a closed con…

Enforce user_id exclusivity for AS registrations

This whole set of checks is kind of an ugly mess, which I may clean up
at some point, but for now let's be correct.

Return events in correct order for /events

Improvements to initial /syncs