Changes in synapse v0.21.0-rc3 (2017-05-17)

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

Features:

* Add per user rate-limiting overrides (PR #2208)
* Add config option to limit maximum number of events requested by ``/sync``
  and ``/messages`` (PR #2221) Thanks to @psaavedra!

Changes:

* Various small performance fixes (PR #2201, #2202, #2224, #2226, #2227, #2228,
  #2229)
* Update username availability checker API (PR #2209, #2213)
* When purging, don't de-delta state groups we're about to delete (PR #2214)
* Documentation to check synapse version (PR #2215) Thanks to @hamber-dick!
* Add an index to event_search to speed up purge history API (PR #2218)

Bug fixes:

* Fix API to allow clients to upload one-time-keys with new sigs (PR #2206)
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