Changes in synapse v0.17.1-rc1 (2016-08-22)

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

Features:

* Add notification API (PR #1028)

Changes:

* Don't print stack traces when failing to get remote keys (PR #996)
* Various federation /event/ perf improvements (PR #998)
* Only process one local membership event per room at a time (PR #1005)
* Move default display name push rule (PR #1011, #1023)
* Fix up preview URL API. Add tests. (PR #1015)
* Set ``Content-Security-Policy`` on media repo (PR #1021)
* Make notify_interested_services faster (PR #1022)
* Add usage stats to prometheus monitoring (PR #1037)

Bug fixes:

* Fix token login (PR #993)
* Fix CAS login (PR #994, #995)
* Fix /sync to not clobber status_msg (PR #997)
* Fix redacted state events to include prev_content (PR #1003)
* Fix some bugs in the auth/ldap handler (PR #1007)
* Fix backfill request to limit URI length, so that remotes don't reject the
  requests due to path length limits (PR #1012)
* Fix AS push code to not send duplicate events (PR #1025)
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