gitignore .dart_tool directory (#30)
gitignore .dart_tool directory (#30)


dart-lang/sdk,dart-lang/sdk,dart-archive/dart2js_info,dart-lang/sdk,dart-lang/dart2js_info,dart-lang/sdk,dart-lang/dart2js_info,dart-lang/sdk,dart-lang/sdk,dart-archive/dart2js_info,dart-lang/sdk,dart-lang/sdk