Extracted xDOTScript to DOTScript class
Fixed rake test task
DOTScript ignores types with empty data
Added DOTScriptData, moved responsibilities from lib/graphviz
Fixes a couple of typos and spacing
Issue #55
Merge pull request #52 from markus1189/extract_dotscript

Extracted xDOTScript to DOTScript class
Merge pull request #54 from miketheman/typos_and_spacing

Fixes a couple of typos and spacing
Add minitest dev dependency
Update AUTHORS and CHANGELOG
Update attributs
Update README
Add Travis-ci status in README
Oups