Drop facet chart from table onto dashboard

This change enables you to drag the facet chart from the table and drop it onto the dashboard to create a panel. The resulting panel will have the same span as the original table.

![screen shot 2014-04-22 at 10 02 34 am](https://cloud.githubusercontent.com/assets/1250387/2768093/09730d54-ca40-11e3-926c-d636cc4bc4cd.png)