apply GPLv2 license to BUSE project (original author must approve)

Adam,
Please license this code. You can choose whatever license you want. I've made choosing GPLv2 as easy as accepting this pull request.
Without a license granting us additional permissions, @comatose and I have no write to do anything other than view your code and/or fork your repository (per Github TOS).
See here for some discussion about this: https://www.infoworld.com/print/208046