Add License

In order to allow others to use the scripts contained in this repository without worrying about possible legal issues, I believe it is wise to add an official license to the repository.  I chose the GNU LGPL because it permits users to connect these scripts to code that is not open source, while requiring that any changes made to RDF-CH be released under an open license.  This is important because under American copyright law, not providing a license means no rights are granted to users, and so even though the code is on GitHub, no one legally has the right to use this repository.  GitHub's [terms of service](https://help.github.com/articles/github-terms-of-service) require that users of the website be allowed to "view and fork your repositories" (F1), but no more.

Releasing these scripts under the LGPL will ensure that even though the RDF is not around, other servers can make use of RDF-CH, and thus all your (our) hard work will not be to waste.

Regarding copyright claims, I did put a header in every file (as is [recommended](http://www.gnu.org/licenses/gpl-howto.html) by the FSF), and I placed the copyrights in the name of "Jessassin," as you were the primary contributor and owner of the repository.

If you have some aversion to the GNU LGPL v3 and would prefer a different license, let me know.  I used a script to generate these headers and could redo them all in a couple minutes, which would be easier overall then trying to rewrite them all by hand.

This commit adds only comments and should have no effect on the code's operation.