Change the d3 icon for attended parcels

[jchubber]

Now it shows a number. Change it to a check mark, and perhaps change the color to green.

[akshatpradhan]

This isn't working, I found this link that might be helpful. http://bl.ocks.org/950642 http://stackoverflow.com/questions/7306250/does-force-directed-layout-of-d3-js-support-image-as-node https://groups.google.com/forum/?fromgroups=#!topic/d3-js/lKB3ikWNmOI