Regenerate gemspec for version 2.8.1

Regenerate gemspec for version 2.8.0

Regenerate gemspec for version 2.7.1

Regenerate gemspec for version 2.7.0

Regenerate gemspec for version 2.6.0

Regenerate gemspec for version 2.5.8

Regenerate gemspec for version 2.5.7

Regenerate gemspec for version 2.5.6

Merge branch 'master' of github.com:appoxy/aws

Merge branch 'master' of github.com:appoxy/aws