Item Details Demo

The item details modal demo implemented. It shows a detail view of the selected item where you can see the price, a bigger image, select a size, and see item details or shipping information.
![screen shot 2014-11-13 at 11 42 47](https://cloud.githubusercontent.com/assets/4637185/5033292/404dbd0c-6b2a-11e4-958a-0ce1111b542d.png)