Remove outer most contours

[ThePenguin1140]

Figure out how to use the contour hierarchy.

Need to make sure that we're only ever creating three contours at the same level that are about the same size.

[ThePenguin1140]

Ran into a little bit of a conceptual problem yesterday.

If we have two overlapping cups then the bounding box would just be one big one. So we need some way of telling if we're looking at one single cup or two overlapping cups.

I think there's two ways to solve this:

1. Identify overlapping cups based on the ratio of the bounding box (i.e. the ratio for a single cup might be 2:1 height:width and an overlapping set of cups would be 1:2)
2. Use masks to identify the sides of cups or whole cups.