MAINT: update pkg_info from dipy copy
MAINT: update pkg_info from dipy copy

Add nipy version printout.  Python 3 compatibility.

alexis-roche/nipy,alexis-roche/nipy,nipy/nireg,alexis-roche/nipy,alexis-roche/nireg,alexis-roche/nireg,nipy/nireg,alexis-roche/nipy