Merge branch 'rf/nibabel-get_data' into 'master'

CHANGELOG.rst

fsl/data/dicom.py

fsl/data/image.py

fsl/data/imagewrapper.py

fsl/data/mghimage.py

fsl/wrappers/wrapperutils.py

tests/test_dtifit.py

tests/test_ensure.py

tests/test_image.py

tests/test_imagewrapper.py

tests/test_immv_imcp.py

tests/test_mghimage.py

tests/test_scripts/test_fsl_apply_x5.py

tests/test_scripts/test_immv_imcp.py

tests/test_wrapperutils.py