admin: Better production config for FoodTruck, provide proper first site. * Use a `settings` object to configure Flask. * Accept an `app.cfg` file in the admin folder to configure Flask. * Get a proper first site name when the cookie isn't set yet.

import os


def slashfix(path):
    if path is None:
        return None
    if isinstance(path, str):
        return path.replace('/', os.sep)
    fixed = []
    for p in path:
        fixed.append(p.replace('/', os.sep))
    return fixed