Changes in synapse v0.27.3 (2018-04-11)

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Bug fixes:

* URL quote path segments over federation (#3082)

Changes in synapse v0.27.3-rc2 (2018-04-09)
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v0.27.3-rc1 used a stale version of the develop branch so the changelog overstates
the functionality. v0.27.3-rc2 is up to date, rc1 should be ignored.

Changes in synapse v0.27.3-rc1 (2018-04-09)
=======================================

Notable changes include API support for joinability of groups. Also new metrics
and phone home stats. Phone home stats include better visibility of system usage
so we can tweak synpase to work better for all users rather than our own experience
with matrix.org. Also, recording 'r30' stat which is the measure we use to track
overal growth of the Matrix ecosystem. It is defined as:-

Counts the number of native 30 day retained users, defined as:-
         * Users who have created their accounts more than 30 days
         * Where last seen at most 30 days ago
         * Where account creation and last_seen are > 30 days"

Features:

* Add joinability for groups (PR #3045)
* Implement group join API (PR #3046)
* Add counter metrics for calculating state delta (PR #3033)
* R30 stats (PR #3041)
* Measure time it takes to calculate state group ID (PR #3043)
* Add basic performance statistics to phone home (PR #3044)
* Add response size metrics (PR #3071)
* phone home cache size configurations (PR #3063)

Changes:

* Add a blurb explaining the main synapse worker (PR #2886) Thanks to @turt2live!
* Replace old style error catching with 'as' keyword (PR #3000) Thanks to @NotAFile!
* Use .iter* to avoid copies in StateHandler (PR #3006)
* Linearize calls to _generate_user_id (PR #3029)
* Remove last usage of ujson (PR #3030)
* Use simplejson throughout (PR #3048)
* Use static JSONEncoders (PR #3049)
* Remove uses of events.content (PR #3060)
* Improve database cache performance (PR #3068)

Bug fixes:

* Add room_id to the response of `rooms/{roomId}/join` (PR #2986) Thanks to @jplatte!
* Fix replication after switch to simplejson (PR #3015)
* Fix replication after switch to simplejson (PR #3015)
* 404 correctly on missing paths via NoResource (PR #3022)
* Fix error when claiming e2e keys from offline servers (PR #3034)
* fix tests/storage/test_user_directory.py (PR #3042)
* use PUT instead of POST for federating groups/m.join_policy (PR #3070) Thanks to @krombel!
* postgres port script: fix state_groups_pkey error (PR #3072)