Work In Progress: Markdown Editor Implementation

The bulk of the markdown editor for the Game Description field is implemented. Here are some remaining issues:

+ Put the "eye" icon inside the textarea and fix the floating of the `<ul>`s and `<ol>`s which is to the right of the container:
![screen shot 2014-04-11 at 7 24 52 pm](https://cloud.githubusercontent.com/assets/4560085/2685680/ac2c57b6-c1d1-11e3-9a13-b438b5604979.png)

![screen shot 2014-04-11 at 7 25 06 pm](https://cloud.githubusercontent.com/assets/4560085/2685681/ae21b282-c1d1-11e3-889c-ab8ba2d07a6e.png)

+ Make sure the game-details page also parses the markup to html.
+ Maybe use a better markdown parser like http://epiceditor.com/.