Changes in synapse v0.20.0-rc1 (2017-03-30)

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

Features:

* Add delete_devices API (PR #1993)
* Add phone number registration/login support (PR #1994, #2055)

Changes:

* Use JSONSchema for validation of filters. Thanks @pik! (PR #1783)
* Reread log config on SIGHUP (PR #1982)
* Speed up public room list (PR #1989)
* Add helpful texts to logger config options (PR #1990)
* Minor ``/sync`` performance improvements. (PR #2002, #2013, #2022)
* Add some debug to help diagnose weird federation issue (PR #2035)
* Correctly limit retries for all federation requests (PR #2050, #2061)
* Don't lock table when persisting new one time keys (PR #2053)
* Reduce some CPU work on DB threads (PR #2054)
* Cache hosts in room (PR #2060)
* Batch sending of device list pokes (PR #2063)
* Speed up persist event path in certain edge cases (PR #2070)

Bug fixes:

* Fix bug where current_state_events renamed to current_state_ids (PR #1849)
* Fix routing loop when fetching remote media (PR #1992)
* Fix current_state_events table to not lie (PR #1996)
* Fix CAS login to handle PartialDownloadError (PR #1997)
* Fix assertion to stop transaction queue getting wedged (PR #2010)
* Fix presence to fallback to last_active_ts if it beats the last sync time.
  Thanks @Half-Shot! (PR #2014)
* Fix bug when federation received a PDU while a room join is in progress (PR
  #2016)
* Fix resetting state on rejected events (PR #2025)
* Fix installation issues in readme. Thanks @ricco386 (PR #2037)
* Fix caching of remote servers' signature keys (PR #2042)
* Fix some leaking log context (PR #2048, #2049, #2057, #2058)
* Fix rejection of invites not reaching sync (PR #2056)
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