BUG: Fix slicing. More consistent with numpy #721
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ENH: Support more indexing options
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Fixing slicing issues detailed in #719. The behavior of slicing should now be consistent with what you get on a numpy array, except that it returns an antsImage for slices with dimensions >= 2.
When slicing by indices, direction matrices are collapsed to identity. Users need to call the slice_image function to control that.
I added support for negative indices, so you can do something like
im[:,:,0:-1]and it behaves as numpy does.