Embeddable widgets

@longhotsummer Can we merge?

The upstream version hosts a copy of all the static files on S3, and then pushes in a new json data file each time that a new chart is accessed. That data file, together with the static files then make up the embedded widget. 

My version does exactly the same, except for hosting the copy of the static files, and the json data at http://wazimap.co.za/static/embed/01/