Feature/bubblechart

![bubblechart](https://cloud.githubusercontent.com/assets/539905/5207940/2cf69366-757d-11e4-854f-7d723ca54190.png)

if you are going to be using the this.options object a ton, consider shortcutting it at the top of the function with a:
```
var opts = this.options
```
Makes things a bit more readable. And if you have to change where the options are coming from in the future it's easier to do, too!