Add tool to dump object images

[avatar42]

Idea is to run through all train and test images saving cropped images of the objects into folders in debug.pics named for the class. This should make seeing mislabeled images easier to see.

[avatar42]

cropped images should be named orgImageName.objNum.jpg

[avatar42]

Note this is diff from trainTest in that it dumps all objects not just "mismatched" ones.