task/ta-npp-002-14 -- nparcel.Emailer() support for templates content

nparcel/daemonservice.py
* new method alert() to generate templates email notification
* new method create_table() takes a list of items and generates string
  based, variable table content

nparcel/emailer.py
* new method get_subject_line() which constructs an email subject line
  from a template