add id and rChart class to iframes so that styling does not interfere with other iframes (fix #324)
add iframe- prefix to iframe id to keep things unique.
minor fix for adding id to iframes written by show.
remove old code for show and getMode
fix class in show iframe, add chartDiv as partial and add bodyattrs to support body attributes
pass partials to whisker in render_template
update datamaps layout to include support for plugins.
update heatmap example in polychart
add preliminary support for bullet charts in nvd3.