task/us151-ta133 -- OnDelivery - Integrate Delivery Partner
configuration into workflow

nparcel/b2cconfig/__init__.py
* new method parse_dict_config() that can parse a ConfigParser section
  into a python dictionary structure
* refactored the business_units and comms_delivery_partner attributes
  to use parse_dict_config()

nparcel/ondeliverydaemon.py
* refactored the process() method so that each PE and SC4 uncollected
  lookup is done per BU ID.  This is so that we can feed in the
  appropriate Delivery Partners into the SQL per BU
* accept business_units and comms_delivery_partners via config
* new method delivery_partner_lookup() that identifies the business
  unit name associated with  a given BU ID and returns a tuple of
  Delivery Partners
* update the _start() method so that each call to the OnDelivery
  process() method provides the BU's Delivery Partners