Upgrade to twitter.common.python 0.5.10.
Review Request #707 - Created July 21, 2014 and submitted
This brings in the following bugfix: "Update the mtime on retranslation of existing distributions. 1bff97e stopped existing distributions from being overwritten, to prevent subtle errors. However without updating the mtime these distributions will appear to be permanently expired wrt the ttl."
Ran all unittests. ci baking.