Merge remote-tracking branch 'origin/master'

Regenerate gemspec for version 0.3.1

Regenerate gemspec for version 0.3.0

Regenerate gemspec for version 0.2.13

Regenerate gemspec for version 0.2.12

Regenerate gemspec for version 0.2.11

Regenerate gemspec for version 0.2.10

Regenerate gemspec for version 0.2.9

Regenerate gemspec for version 0.2.8

Regenerate gemspec for version 0.2.7