Temporarily disable Python 3.x tests, until #338 can be resolved.
Temporarily disable Python 3.x tests, until #338 can be resolved.

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