Utilize select_related() for user & user profiles. This commit also removes the caching of the avatar URL in the avatar template tag. This is because we are now using select_related, so we already have the profile & avatar when we get to the tag. Thus we don't need to waste time querying the cache. Removed an apparently unused member map template as well.

"""
Celery tasks for the POTD app.

"""
from __future__ import absolute_import

from celery import shared_task

import potd.tools


@shared_task
def pick_potd():
    potd.tools.pick_potd()