Changes in synapse v0.22.0-rc1 (2017-06-26)

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

Features:

* Add a user directory API (PR #2252, and many more)
* Add shutdown room API to remove room from local server (PR #2291)
* Add API to quarantine media (PR #2292)
* Add new config option to not send event contents to push servers (PR #2301)
  Thanks to @cjdelisle!

Changes:

* Various performance fixes (PR #2177, #2233, #2230, #2238, #2248, #2256,
  #2274)
* Deduplicate sync filters (PR #2219) Thanks to @krombel!
* Correct a typo in UPGRADE.rst (PR #2231) Thanks to @aaronraimist!
* Add count of one time keys to sync stream (PR #2237)
* Only store event_auth for state events (PR #2247)
* Store URL cache preview downloads separately (PR #2299)

Bug fixes:

* Fix users not getting notifications when AS listened to that user_id (PR
  #2216) Thanks to @slipeer!
* Fix users without push set up not getting notifications after joining rooms
  (PR #2236)
* Fix preview url API to trim long descriptions (PR #2243)
* Fix bug where we used cached but unpersisted state group as prev group,
  resulting in broken state of restart (PR #2263)
* Fix removing of pushers when using workers (PR #2267)
* Fix CORS headers to allow Authorization header (PR #2285) Thanks to @krombel!
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