task/ta-npe-002-06 -- slurp comm files

nparcel/comms.py
* remove _create_dir method as it doesn't make sense at this level.
  If the
  comms directory does not exist then we simply don't process any files
* new method get_comms_files() which produces a list of files in the
  comms_dir attribute

nparcel/reminder.py
* clean up commented out sections
* refactor the comms_dir initialisation