BF: import nosetester explicitely for a doctest Otherwise it leads to failures with fresh numpy where testing.nosetester is
not automatically imported. See e.g.
https://travis-ci.org/nipy/nipy/jobs/
442714642
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changeset_aafe079d3bc2928c159cf2ecaa9fbdb3f6520e027529ffc4585ba67171219aa29a3f6c5df9963f1d
Gbp-Pq: Name changeset_aafe079d3bc2928c159cf2ecaa9fbdb3f6520e027529ffc4585ba67171219aa29a3f6c5df9963f1d.diff
BF: fix for division error gh-446 Thanks to @Amiiir for tracking down this error.
Closes gh-446.
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