Changes in synapse v0.23.0-rc1 (2017-09-25)

===========================================

Features:

* Add a frontend proxy worker (PR #2344)
* Add support for event_id_only push format (PR #2450)
* Add a PoC for filtering spammy events (PR #2456)
* Add a config option to block all room invites (PR #2457)

Changes:

* Use bcrypt module instead of py-bcrypt (PR #2288) Thanks to @kyrias!
* Improve performance of generating push notifications (PR #2343, #2357, #2365,
  #2366, #2371)
* Improve DB performance for device list handling in sync (PR #2362)
* Include a sample prometheus config (PR #2416)
* Document known to work postgres version (PR #2433) Thanks to @ptman!

Bug fixes:

* Fix caching error in the push evaluator (PR #2332)
* Fix bug where pusherpool didn't start and broke some rooms (PR #2342)
* Fix port script for user directory tables (PR #2375)
* Fix device lists notifications when user rejoins a room (PR #2443, #2449)
* Fix sync to always send down current state events in timeline (PR #2451)
* Fix bug where guest users were incorrectly kicked (PR #2453)
* Fix bug talking to IPv6 only servers using SRV records (PR #2462)
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