I just merged a pull request to add the apache license header to all the files:
https://github.com/apache/incubator-tinkerpop/pull/2 There may yet be some stragglers, but it looked like the bulk of the files have been updated. Please make sure to add the appropriate license header info to all future files added to the repository. The person submitting the PR expected to submit another one with a maven plugin check to ensure that all files had a proper header, so I suspect we'll get some more help there in maintaining consistency there. Thanks, Stephen
