Add a License to source code

[YetAnotherMinion]

Please add any license to this repository. My company would like to use this tool and contribute fixes based on the website demo, but we cannot touch anything or even look at the source code without a clear license. Right now any contribution to this repository would be a felony.

One of the enhancements we would like to contribute is generating replacement selectors from the frequency distribution of the containing html document; which should improve compression slightly.

You can add a license file from the web interface on Github nowadays in under 1 minute. Just click on create new file in the header of the repository view on Github.com. Then name the file LICENSE and a Want to use a template? button will appear directly to the far right of the filename, where you can choose from a large number of open source licenses with one click.