Change License from GPL to LGPL

[not-cl-jbeaudry]

I'd like to use this as part of a project which has some aspects that are closed source and unfortunately the GPL license would not allow that. Fortunately the LGPL (which is designed for libraries) does allow this. I'm simply replacing the GPL license with the LGPL.

As well, I've cleaned up a few things, removed the qs dependency (as node has a bundled querystring module) and removed the node_modules directory from the repo.

[not-cl-jbeaudry]

Are you going to stick with the GPL license?

[wolframkriesing]

would be nice to have it under MIT or so, GPL might reduce the possible spread