task/ta-npe-002-07 -- send reminder.py comms

nparcel/comms.py
* new method process() which slurps communication files from comms_dir
  attribute and attempts to send comms via appropratie medium
* factored in the get_agent_details() method from nparcel/reminder.py
* new method parse_comm_filename() which extracts the job_item.id and
  template type from the comms filename

nparcel/reminder.py
* factored out the get_agent_details() method to nparcel/comms.py

nparcel/restsmser.py
* updated the create_comms() method so that it defaults to the newly
  named sms_body_xml.t template