FIX: update glm beta variance example for Py3
FIX: update glm beta variance example for Py3

Future imports and print_function

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