When default/fallback URL contains query, the options are thrown away

Imagine this Python example:

libravatar.libravatar_url(email='fo',default='https://launchpadlibrarian.net/74643267/64.png?b=3&g=8&c=5')

This will produce:

http://cdn.libravatar.org/avatar/eed807024939b808083f0031a56e9872?d=https%3A%2F%2Flaunchpadlibrarian.net%2F74643267%2F64.png%3Fb%3D3%26g%3D8%26c%3D5

That's fine, but not the whole URL including the query string is passed as an default image, but only the URl without options.

Most importantly, this makes it impossible to use workflow similar to this:

libravatar(dafult=gravatar(default=my_image))

So this piece of code doesn't work as expected:

       query = {
            's': size,
            'd': absolute_default,
        }

        query = urllib.urlencode(query)

        gravatar_hash = md5(email).hexdigest()
        gravatar_url = "https://secure.gravatar.com/avatar/%s?%s" % (gravatar_hash, query)

        return libravatar.libravatar_url(
            openid=openid,
            size=size,
            default=gravatar_url,
        )