Merge branch 'master' of github.com:kubernetes-incubator/client-pytho… …n into release-1.0

Update release version to 1.0.0a4 

Use setuptools normalized version 1.0.0a3 

Merge pull request kubernetes-client#45 from kubernetes-incubator/o5 Update version to alpha.2 as alpha.1 is used for a failed release