ENH: Adding vox2ras_tkr
FIX(?): Add zooms test
FIX: Deal with borked test dataset
FIX: Match MRIRead.m
FIX?: Order
RF: make header update only if changed affine

We were having trouble with the header updating on load of an image, and
changing the underlying header information.

https://github.com/nipy/nibabel/pull/164

Use the Analyze trick to only update the header if the affine has
changed.
BF: with new save affine algorithm, zooms=1

No we are not resetting the deltas on loading the image, we should get
zooms of 1 from the test image.
Merge pull request #1 from matthew-brett/setting-mgh-affines

Setting mgh affines
FIX: Reverting to mri_info test compat
TST: add test for cosine vector order

We weren't previously testing the transpose / not-transpose of the
cosine vectors because the test dataset had a symmetical 3x3 in the
affine.
Merge pull request #2 from matthew-brett/mgh-cosine-vector-order

TST: add test for cosine vector order
Merge pull request #164 from Eric89GXL/vox2ras_tkr

ENH: Adding vox2ras_tkr

This adds the support requested in issue #163 for access to the vox2ras_tkr output from the MGH format.