jQuery is provided under MIT license <https://jquery.org/license/>
D3 under BSD license <https://github.com/mbostock/d3/blob/master/LICENSE>
Epoch under MIT license <https://github.com/epochjs/epoch/blob/master/LICENSE>
TopoJSON under BSD license <https://github.com/mbostock/topojson/blob/master/LICENSE>
DataMaps under MIT license <https://github.com/markmarkoh/datamaps/blob/master/LICENSE>
