BF: workaround missing __package__ in Python 3.2
BF: workaround missing __package__ in Python 3.2

Python 3.2 does not set __package__; work around for now.

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