Normalize remote href
    :param href: remote path
    :return: normalize href

    >>> remote("/test/hello.txt")
    u'/test/hello.txt'
    >>> remote("test/hello.txt")
    u'/test/hello.txt'
    >>> remote("test\hello.txt")
    u'/test/hello.txt'
    >>> remote(None)
    u'/'

def remote(href):
    """
    Normalize remote href
    :param href: remote path
    :return: normalize href

    >>> remote("/test/hello.txt")
    u'/test/hello.txt'
    >>> remote("test/hello.txt")
    u'/test/hello.txt'
    >>> remote("test\hello.txt")
    u'/test/hello.txt'
    >>> remote(None)
    u'/'
    """
    href = _(href)
    href = os.path.join(u("/"), href)
    if os.sep == "\\":
        href = href.replace("\\", "/")
    return href