* 1.54 release.
* Numerous patches to attempt to get Python 3 working, but
tests are still failing under Python 3, so this code is not ready
yet.
* MemcachedKeyCharacterError better describes key problem.
Suggested by Roy Smith
* Added touch(), patch by erankor on github.
* Allow empty server list, patch by zewt on github.
* If unknown flags in get request, raises a value error rather than the
code bombing out.
* Setting the SERVER_MAX_* values after import did not work, despite
being documented to. Reported by alexf101 on github.
42b7baa035