task/ta-npi-023-03 -- base b2cconfig.py from config.py

nparcel/b2cconfig.py
* class B2CConfig now inherits from Config()
task/ta-npi-023-05 -- prepare notification_delay and start_date config
items

nparcel/conf/npreminder.conf
* new config file for the reminder facility

nparcel/reminder.py
* new attributes notification_delay and start_date
* new method parse_config() which reads config items form the Reminder
  configuration file