Remove django-spreadsheetresponsemixin
Remove django-spreadsheetresponsemixin

Now that the there is a copy of it in the code, it no longer needs to be
installed as a package
aptivate/alfie,aptivate/alfie,aptivate/kashana,daniell/kashana,aptivate/kashana,aptivate/alfie,daniell/kashana,daniell/kashana,aptivate/kashana,daniell/kashana,aptivate/kashana,aptivate/alfie