Update Readme (#83)

- [x] Update "Installation" section
- [x] Add information about using as a Node.js module
- [x] Show example of using as a global and a local module

![tumblr_markxkquxa1r5cvcxo1_250](https://f.cloud.github.com/assets/872004/1533998/a97021e6-4c8e-11e3-8c87-64911d837da7.gif)