Add Python 3.6 to travis build
Add Python 3.6 to travis build

mistio/libcloud,samuelchong/libcloud,apache/libcloud,erjohnso/libcloud,pquentin/libcloud,erjohnso/libcloud,Kami/libcloud,mistio/libcloud,samuelchong/libcloud,SecurityCompass/libcloud,mgogoulos/libcloud,pquentin/libcloud,ByteInternet/libcloud,apache/libcloud,ZuluPro/libcloud,ByteInternet/libcloud,ByteInternet/libcloud,SecurityCompass/libcloud,vongazman/libcloud,Kami/libcloud,andrewsomething/libcloud,Scalr/libcloud,StackPointCloud/libcloud,andrewsomething/libcloud,techhat/libcloud,andrewsomething/libcloud,illfelder/libcloud,vongazman/libcloud,techhat/libcloud,t-tran/libcloud,apache/libcloud,Kami/libcloud,samuelchong/libcloud,mgogoulos/libcloud,Scalr/libcloud,StackPointCloud/libcloud,erjohnso/libcloud,vongazman/libcloud,Scalr/libcloud,t-tran/libcloud,illfelder/libcloud,pquentin/libcloud,t-tran/libcloud,mistio/libcloud,ZuluPro/libcloud,illfelder/libcloud,techhat/libcloud,ZuluPro/libcloud,StackPointCloud/libcloud,SecurityCompass/libcloud,mgogoulos/libcloud