add matfromfile function and modify fromfile function to accept a filename or open stream
add matfromfile function and modify fromfile function to accept a filename or open stream

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