NF: setup helper for windows executable scripts
NF: setup helper for windows executable scripts

Now we have tests for the scripts, I finally find out that the scripts
weren't executable on Windows using the default install.

Add a distutils hack adapted from Twisted / IPython to make the
installed scripts executable from the Windows command line.

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