Min/max ranges added.  Better handling of missing.
Min/max ranges added.  Better handling of missing.

Instead of a bar chart, data are now displayed as an SVG line, extending
from the min to the max.  There is also a circle displayed at the mean.

To Do:

-  Add quartile computation (and maybe switch from mean to median)
-  Improve transitions (haven't had much luck queuing them so far)

ethankale/ecy-wa-s8d,ethankale/ecy-wa-s8d