task/ta-npi-022-07 -- integrate RestSmser class into loader.py

nparcel/loader.py
* refactored the Loader() __init__ so that the SMS API details are
  capture in a dictionary structure
* refactored the send_sms() method to support the RestSmser structure

nparcel/loaderdaemon.py
* updated the _start() method so that is constructs the required SMS API
  construct to pass to the Loader() initialiser

nparcel/restsmser.py
* new method create_comms() to create the SMS data string to send