#52 Add morphological operations (dilate, erode, etc)

[justry]

Hi. It works be great to be able to apply morphological operations such as dilation, erosion, opening, and closing to the segmentation maps.

On an unrelated note it would also be great to be able to save the trained classifier.

[justry]

Being able to save classifiers will also allow users to share their trained classifiers, maybe establish a classifier repository, which will make itk snap a lot more powerful.

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