Please consider adding a License

[rrrrrrmb]

We would like to use the example data for writing test suites for pplacer package in debian. So please consider adding a license to the data so that we could use them

[nileshpatra]

@habnabit would you have any comments about this? Or if this is already licensed under some clause, could you point us towards that?

[nileshpatra]

Asking you since you happened to have last committed to the repo