Log Message:
py-memcached: updated to 1.59

1.59:
* Added testing for Python 3.5 and 3.6
* Fixed typos in docstrings
* Removing Python 2.6, 3.2, and 3.3 testing
* Removing unnecessary parens in return statements
* Remove unused _has_unicode/_str_cls vars
* Add flake8 testing and cleanups
* Fixed storing non-ASCII values on Python 2 and binary values on Python 3
* Fixed touch(..., time=0) command