first take at wiring backbone - posts

Added the required js files
- Backbone.js
- Underscore.js
- Jquery

Took a shot at posts, added a post.js that handles the backbone stuff and where the api calls are made. 
Added post view, handles all the HTML and is the template for the backbone view.
Added header file that renders the js. 
All this is quite rough but would be good to know whether my line of thought is same with everyone else.
@rjmackay @dkobia - give it a look before I continue further.