Update express app

#### Complete initial express app

- update the base express app to create a server that listens on port 3000
- add `npm start` script for easy running
- update basic `package.json` `README` & standards
- change `public/stylesheets` to `public/css` & remove `bin` folder

:zap: :full_moon_with_face: :zap: :octocat: :zap: :thumbsup: 

______


![screenshot 2014-07-18 20 23 17](https://cloud.githubusercontent.com/assets/1064684/3623867/e73279f6-0e54-11e4-9759-27103badc0b1.png)