ICalico should not inject element in HTML, but add div

[Doug Blank]

From:

http://mail.scipy.org/pipermail/ipython-dev/2014-April/013745.html

"throw a div on the page using an HTML output with a particular id and then append directly to that div."

[Doug Blank]

The Google Javascript Chart widgets now do this. They don't implement the IPython Widget class, but they could. That would allow further interaction with the widget, such as getting the ImageURI.