v0.9.2

Changes in synapse v0.9.2 (2015-06-12)

General:

• Use ultrajson for json (de)serialisation when a canonical encoding is not
  required. Ultrajson is significantly faster than simplejson in certain
  circumstances.
• Use connection pools for outgoing HTTP connections.
• Process thumbnails on separate threads.

Configuration:

• Add option, gzip_responses, to disable HTTP response compression.

Federation:

• Improve resilience of backfill by ensuring we fetch any missing auth events.
• Improve performance of backfill and joining remote rooms by removing
  unnecessary computations. This included handling events we'd previously
  handled as well as attempting to compute the current state for outliers.