Add scatter over time chart and use CartoDB data

![scatter-over-time](https://cloud.githubusercontent.com/assets/6386/5265147/4599a42c-7a0e-11e4-8481-0bfea4a3c4d2.png)

Consider adding a TODO that will encapsulate all of the 'controller' logic in this module. E.g. the template creation/attach and the events that are defined later in the plot function.