task/de40-ta138 -- Incomplete subject heading for SMS and email failed
notifications

nparcel/emailer.py
* removed a redundant version of the get_subject_line() method.  There
  were actually two methods with the same name in the module
* refactored the get_subject_line() method so that the removal of the
  trailing newline is managed in the parcel.utils.files.templater()
  function

nparcel/utils/files.py
* update the templater() function so that is strips off the trailing
  newline