Merge pull request #26 from rafaelgonzalez/dice-cup

Add DiceBox::Cup commodity class
Fix spelling
Remove punctuation
Ignore pkg/ directory
Merge pull request #28 from rafaelgonzalez/fix-documentation

Fix documentation
Remove 1.9.3
Add JRuby support
Update supported rubies in README
Merge pull request #29 from rafaelgonzalez/update-supported-rubies

Update supported rubies
Merge pull request #27 from rafaelgonzalez/update-gitignore

Ignore pkg/ directory
Merge branch 'master' into dice-notation