Changes in synapse v0.18.2-rc3 (2016-10-27)

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Changes:

* Clarify error codes for GET /filter/, thanks to Alexander Maznev (PR #1164)
* Make password reset email field case insensitive (PR #1170)
* Reduce redundant database work in email pusher (PR #1174)
* Allow configurable rate limiting per AS (PR #1175)
* Check whether to ratelimit sooner to avoid work (PR #1176)
* Standardise prometheus metrics (PR #1177)

Bug fixes:

* Fix incredibly slow back pagination query (PR #1178)
* Fix infinite typing bug (PR #1179)
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