basic modifications

- added a `package.json` for `serve.js`
- modified `README.md` with instructions on how to serve up the files using `serve.js` script
- added `node_modules/` to `.gitignore`
- removed `angular.min.js` from VCS; using CDN urls instead.
- updated to latest stable AngularJS version
- corrected invalid html in `angular/index.html`
- wrapped `angular/js/app.js` in a IIFE so we do not pollute the global scope