Bump version to 3.1.1
Bump version to 3.1
Bump version to 3.0 alpha4
Bump version to 3.0 alpha3
Bump version to 3.0 alpha2
Bump version to 3.0 alpha1
Bump version to 2.7 experimental1
Bump version to 2.6.1
Bump version to 2.6
Bump version to 2.6 beta1