Adding some management commands to the downloads application to help manage the SG101 MP3 compilations. Added a command to generate a HTML report of all the downloads in a given category. Added a command that generates a bash script that wgets all the files in a category.

"""
Celery tasks for the POTD app.

"""
from celery.task import task

import potd.tools


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