Updating to latest masters

Deployed new service (6579c1b1a01e09c6d3806a74b8e3e2152c293aae):
* Use proper extension for downloaded file (partial fix for bug 71286)
* Log the total user-experienced render time to statsd
* Shrink expiry for temp files and postmortem files
  (to 6 hours and 1 day, respectively)
* Reduce basic cache expiry time to 2 days (from 3)
* Bug fix: utime was setting directory times 1000 years in the future.
* Bug fix: we were only gc'ing the first subdirectory in the output directory.

Change-Id: I51f8c211ae82f56e44f9416bfa96520351ceb31b