Changes in synapse v0.16.0-rc2 (2016-06-08)

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

Features:

* Add configuration option for tuning GC via ``gc.set_threshold`` (PR #849)

Changes:

* Record metrics about GC (PR #771, #847, #852)
* Add metric counter for number of persisted events (PR #841)

Bug fixes:

* Fix 'From' header in email notifications (PR #843)
* Fix presence where timeouts were not being fired for the first 8h after
  restarts (PR #842)
* Fix bug where synapse sent malformed transactions to AS's when retrying
  transactions (Commits 310197b, 8437906)

Performance Improvements:

* Remove event fetching from DB threads (PR #835)
* Change the way we cache events (PR #836)
* Add events to cache when we persist them (PR #840)
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