[WIP] Updated default chart theme, added sass file for styling

@martinpovolny Please review. For some reason, I'm not seeing the updated styling now when I expand the chart. See below:
![screen shot 2014-10-17 at 1 50 49 pm](https://cloud.githubusercontent.com/assets/1287144/4683406/53f30cae-5626-11e4-8ff4-f17bffeb0f63.png)