Changes in synapse v0.26.0-rc1 (2017-12-13)

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

Features:

* Add ability for ASes to publicise groups for their users (PR #2686)
* Add all local users to the user_directory and optionally search them (PR
  #2723)
* Add support for custom login types for validating users (PR #2729)

Changes:

* Update example Prometheus config to new format (PR #2648) Thanks to
  @krombel!
* Rename redact_content option to include_content in Push API (PR #2650)
* Declare support for r0.3.0 (PR #2677)
* Improve upserts (PR #2684, #2688, #2689, #2713)
* Improve documentation of workers (PR #2700)
* Improve tracebacks on exceptions (PR #2705)
* Allow guest access to group APIs for reading (PR #2715)
* Support for posting content in federation_client script (PR #2716)
* Delete devices and pushers on logouts etc (PR #2722)

Bug fixes:

* Fix database port script (PR #2673)
* Fix internal server error on login with ldap_auth_provider (PR #2678) Thanks
  to @jkolo!
* Fix error on sqlite 3.7 (PR #2697)
* Fix OPTIONS on preview_url (PR #2707)
* Fix error handling on dns lookup (PR #2711)
* Fix wrong avatars when inviting multiple users when creating room (PR #2717)
* Fix 500 when joining matrix-dev (PR #2719)
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