add filename test
Update AUTHORS
Merge pull request #4 from sunglim/test

add filename test
nit changes to files test
sdkDir returns null if unable to locate Dart SDK
Merge pull request #5 from sunglim/sdkDir

sdkDir returns null if unable to locate Dart SDK
rev to 0.4.3
rev to 0.4.4-dev
merge google/grinder