Remove node_modules, use package.json instead

First of all, nice project! :)

Instead of committing your node_modules directory, you should instead be declaring your dependencies in a 'package.json' file so they're downloaded using npm.

Since a lot of files were removed, there's a lot of changes in this pull request, but basically it boils down to this:

* Deleting 'node_modules'
* Adding a '.gitignore' file to ignore any installed modules, and npm debug logs
* Adding a 'package.json' file with the dependencies, and some basic details
* Removing the 'express' dependency, as you're using 'node-static' instead
* Updating the readme to reflect the need for an `npm install` step