changed call to load_nii to load_untouch_nii
replaced contents of readFileNifti.m with a call to niftiReadMatlab.m, and, inside niftiReadMatlab, replaced call to load_nii with call to load_untouch_nii
Merge pull request #73 from vistalab/readFileNiftiFix

changed call to load_nii to load_untouch_nii