RF: Update conformation to reorient, rescale and resample #1
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This approach treats rescaling the affine matrix as its own problem, addressing nipy#670 in passing. The tests ensure that orientation and centroid are unchanged when updating voxel sizes.
We can then use that to take a reoriented image and resample it.
The reason to reorient first is if a non-cubic field-of-view or inhomogeneous voxel size is requested. Suppose we have an RSA image, and we want RAS with voxel size (1, 1, 1.2) and dimension (256, 128, 256). If we resample first, then we end up with an RSA image with (1, 1, 1.2) voxels in a (256, 128, 256) grid. Reorienting, we now get an RAS image with (1, 1.2, 1) voxels in a (256, 256, 128) grid.