task/ta-npi-023-08 -- factor out db_kwargs from b2cconfig.py to base
config.py

nparcel/b2cconfig.py
* factored out the db_kwargs() method into config.py

nparcel/config.py
* new method db_kwargs() taken directly from parcel/b2cconfig.py

nparcel/reminder.py
* updated the __init__() method signature to include a new "db" argument
* __init__() method supports database sessions