Changes in synapse v0.17.1 (2016-08-24)

Changes:

• Delete old received_transactions rows (PR #1038)
• Pass through user-supplied content in /join/$room_id (PR #1039)

Bug fixes:

• Fix bug with backfill (PR #1040)

Changes in synapse v0.17.1-rc1 (2016-08-22)

Features:

• Add notification API (PR #1028)

Changes:

• Don't print stack traces when failing to get remote keys (PR #996)
• Various federation /event/ perf improvements (PR #998)
• Only process one local membership event per room at a time (PR #1005)
• Move default display name push rule (PR #1011, #1023)
• Fix up preview URL API. Add tests. (PR #1015)
• Set Content-Security-Policy on media repo (PR #1021)
• Make notify_interested_services faster (PR #1022)
• Add usage stats to prometheus monitoring (PR #1037)

Bug fixes:

• Fix token login (PR #993)
• Fix CAS login (PR #994, #995)
• Fix /sync to not clobber status_msg (PR #997)
• Fix redacted state events to include prev_content (PR #1003)
• Fix some bugs in the auth/ldap handler (PR #1007)
• Fix backfill request to limit URI length, so that remotes don't reject the
  requests due to path length limits (PR #1012)
• Fix AS push code to not send duplicate events (PR #1025)