gem build buildar.gemspec works!
rake bump_build to 1.2.0.2
rake bump_build to 1.2.0.3
rake bump_build to 1.2.0.4
rake bump_build to 1.2.0.5
rake bump_build to 1.2.0.6
rake bump_build to 1.2.0.7
gemspec file support; better version
provisional :gem_build