Assign a color to each box in a box plot.
refactored to use default color accessor
amputated vestigial comment
Clicking on a box in a box plot filters the graph.
Use getColor(d, i) when generating a color for a box plot.
Move deselected box colors into CSS.

Apply colors as an attr, not a style.
Refactored out label positioning into helper function
Added pie chart labeling with settable external offset
Added legend with colors for pie chart
added hover highlighting via legend
refactored out repeated code in legend stuff
refactored stack hiding out of legend and into stackable charts
Added filtering for pie chart through legend
Forgot a semicolon :C
External labels are now stylable via css
Another semicolon :C
Refactored repeated positioning logic
Finished refactoring knowledge of stackable charts from legend. Charts now can tell whether a legendable is hidden
Merge pull request #396
add legend to pie chart example