Updating to latest masters

Deployed new service (037f01ca8c9c9beb66ddfca6d1f78c69b59df97f):
* Fix redis garbage collection of status objects.
* Fix redis key expiration time (should be seconds, not milliseconds).
* Improve the gc `cleanDir` function to handle nested directories.
* Write output files in subdirectories to avoid having an excessive number
  of files in one directory.
* Remove some blocking operations in the backend.
* Ensure postmortem moves complete before cleanup.

Deployed new latexer (de5b32c9579169067f3dd87ef04675184c278e77):
* Treat `zh` language code as if it were `zh-Hans`
  (that is, Simplified Chinese)
* Match language codes case-insensitively.

Change-Id: I2ec999710ba836941d7f8de5ebe1a92d2148cf76