Changes in synapse v0.17.0-rc4 (2016-08-05)

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

Changes:

* Change the way we summarize URLs when previewing (PR #973)
* Add new ``/state_ids/`` federation API (PR #979)
* Speed up processing of ``/state/`` response (PR #986)

Bug fixes:

* Fix event persistence when event has already been partially persisted
  (PR #975, #983, #985)
* Fix port script to also copy across backfilled events (PR #982)
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