special/sp-01 -- enable email notifications

nparcel/emailer.py
* send() method now returns a status result

nparcel/loader.py
* process() method now accepts an email address list as an argument
* process() method now sends out email notifications with the
  inclusion of of the send_mail() call
* new method send_mail() which manages customer email comms

 nparcel/loaderdaemon.py
* support for "special" email notifications

nparcel/table/agent.py
* new method agent_id() which is a SQL wrapper to return return Agent
  details of a given id