Regenerate gemspec for version 1.5.4

Regenerate gemspec for version 1.5.3

Regenerate gemspec for version 1.5.2

Regenerate gemspec for version 1.4.3

Regenerated gemspec for version 1.4.2

Regenerated gemspec for version 1.4.1

Regenerated gemspec for version 1.4.0

Regenerated gemspec for version 1.3.0

Regenerated gemspec for version 1.2.2

updated to 1.1