strange tick placement at edges [lcarr project]

[lindsayplatt]

lcarr branch: extraticks

Shows up for goal differential data only.

Y-axis:

X-axis:

[lindsayplatt]

kind of this: https://stackoverflow.com/questions/13669239/remove-end-ticks-from-d3-js-axis

[lindsayplatt]

But more than just showing the tick, I want the last tick to be the edge of the plot