Regenerate gemspec for version 1.13.2

Regenerate gemspec for version 1.13.1

Regenerate gemspec for version 1.13.0

Version bump to 1.12.2

Version bump to 1.12.1

Version bump to 1.12.0

Regenerate gemspec for version 1.11.2

Regenerate gemspec for version 1.11.1

Declare the MIT license in the gemspec.

Release 1.10.3, with the dependency on nokogiri relaxed to 1.4.0.