Ready to publish on npm

Added a package.json file and an example based on the website.

The Makefile has been modified to generate a nodejs-compatible version in
node_dist/cssParser.js.
Updated cssParser.js
Better README
Do not ignore the node_dist directory on npm

See https://www.npmjs.org/doc/developers.html#Keeping-files-out-of-your-package

"If you want to include something that is excluded by your .gitignore
file, you can create an empty .npmignore file to override it."
Merge pull request #2 from bpierre/npm-ready

Npm ready