Adding the 'six' module to Travis
Adding the 'six' module to Travis

sontek/pymemcache,bwalks/pymemcache,pinterest/pymemcache,sontek/pymemcache,duanhongyi/pymemcache,ewdurbin/pymemcache,pinterest/pymemcache,harlowja/pymemcache,mbrukman/pymemcache,dive-tv/pyelasticache_client,adamchainz/pymemcache,methane/pymemcache,thedrow/pymemcache