ENH: FDR - catch having NaNs, faster pth_from_pvals
ENH: FDR - catch having NaNs, faster pth_from_pvals

new:
In [28]: %timeit FDR().pth_from_pvals(all_data_p, 0.05)
100 loops, best of 3: 14.3 ms per loop

old:
In [14]: %timeit FDR().pth_from_pvals(all_data_p, 0.05)
10 loops, best of 3: 57.2 ms per loop

nipy/nipy-labs,bthirion/nipy,arokem/nipy,alexis-roche/nipy,arokem/nipy,bthirion/nipy,alexis-roche/nireg,alexis-roche/nireg,alexis-roche/nipy,alexis-roche/niseg,bthirion/nipy,alexis-roche/nipy,alexis-roche/register,bthirion/nipy,nipy/nireg,alexis-roche/register,arokem/nipy,arokem/nipy,alexis-roche/register,nipy/nipy-labs,alexis-roche/nipy,alexis-roche/niseg,nipy/nireg