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Also, removed the saving of the upsample which I missed from
before (since I'm not using the struct now). I understand why
the upsample was being saved, but I don't necessarily agree it
is particularly useful as you should really be upsampling on
a case by case basis at test time.

Exposes the test method, but takes in images and bounding boxes.
Seems fairly simply to extend the API

directly on already loaded data rather than needing to use an XML file as
input.

in color instead of always converting to grayscale.