task/ta-email-01 - integrate the new nparcel/emailer.py module

nparcel/emailer.py
* new Emailer() class to support email messaging
task/ta-email-02 -- integrate emailer into nparcel/bin/nploaderd

nparcel/emailer.py
* rework of the send() method to capture exceptions and handle empty
  recipient lists

nparcel/loaderdaemon.py
* integrate the nparcel/emailer.py module
* updated the _start() method to send email comms if an erroneous
  record is detected during processing

nparcel/reporter.py
* report() method now returns a report string, not log report
* deprecated the "email" attribute as emailer.py handles email
  functions directly