task/ta-npe-002-33 -- message queue length error warnings and errors:
alerts facility

nparcel/templates/email_message_q_err_html.t
nparcel/templates/email_message_q_warn_html.t
* new email templates for message queue alerting

nparcel/commsdaemon.py
* include nparcel/emailer.py support
* updated the _start() method to send out comms if message queue
  theresholds are breached

nparcel/emailer.py
* new method create_comms() which creates the MIME multipart message