task/us158-ta149 -- Filter - Delivery Partner based rule filtering
and distribution

nparcel/conf/nparceld.conf
* rename the [filter] section to [filters] as it now represents a
  dictionary of Alternate Delivery Partner names and a list
  of tokens to match against the start of the agent code field in the
  source T1250 file

nparcel/ondeliverydaemon.py
* refactor the write() method so that is accepts a delivery_partner
  name and uses this to determine the outbound directory structure