Passing the module's filename to the callback
reverted log message in test case.
Pushed version number, added contributor
added "engines" to require node >=0.10
fix build error on node 0.8 - updated .travis.yml to test with node 0.10
updated README description and examples to include new `filename` parameter.
Merge pull request #2 from AndreasPizsa/master

Passing the module's filename to the callback