import babel in setup.py breaks linux installs

The setup.py file contains both an "import babel" and a babel requirement.
When running the setup, babel should be installed as a dependency and should not be required by the setup itself.
This seems to be done to workaround a bug in windows with py2exe.
However on Linux we don't need this workaround : the workaround for windows is turned into a bug for linux.

I suggest to move the "import babel" in the "if" block for windows (as it was probably intended to be done) :

setup.py:41 :

    if os.name == 'nt':
        r.append(("Microsoft.VC90.CRT", glob.glob('C:\Microsoft.VC90.CRT\*.*')))

        import babel
        r.append(("localedata",
                  glob.glob(os.path.join(os.path.dirname(babel.__file__), "localedata" , '*'))))