Update version constants for 1.0.0b1 release

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