Changes in synapse v0.22.0-rc2 (2017-07-04)

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Changes:

* Improve performance of storing user IPs (PR #2307, #2308)
* Slightly improve performance of verifying access tokens (PR #2320)
* Slightly improve performance of event persistence (PR #2321)
* Increase default cache factor size from 0.1 to 0.5 (PR #2330)

Bug fixes:

* Fix bug with storing registration sessions that caused frequent CPU churn
  (PR #2319)
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