Send via admin

Addresses #5 .

Testing:

    $ fab mac.syncdb && mysql.server restart
    $ ENVIRONMENT=migration ./manage.py migrate tt_dailyemailblast

Open replace the existing recipient list with a new one containing only yourself:

    $ open http://localhost:8000/admin/tt_dailyemailblast/dailyemailblast/1/

Finally, click **Actions -> Send Blasts**.

This PR is not changing backend to async for now due to there only being two emails to send.