Changes in synapse v0.17.2-rc1 (2016-09-05)

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

Features:

* Start adding store-and-forward direct-to-device messaging (PR #1046, #1050,
  #1062, #1066)

Changes:

* Avoid pulling the full state of a room out so often (PR #1047, #1049, #1063,
  #1068)
* Don't notify for online to online presence transitions. (PR #1054)
* Occasionally persist unpersisted presence updates (PR #1055)
* Allow application services to have an optional 'url' (PR #1056)
* Clean up old sent transactions from DB (PR #1059)

Bug fixes:

* Fix None check in backfill (PR #1043)
* Fix membership changes to be idempotent (PR #1067)
* Fix bug in get_pdu where it would sometimes return events with incorrect
  signature
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