0.12 pre-release work

general cleanup
task/ta-npe-mapper-01 -- introduce new mapper.py module
task/ta-npe-mapper-02 -- integrate raw FIELDS map and nparcel/parser.py

nparcel/mapper.py
* defined new globals FIELDS and MAP which are used to parse the
  source record and translate to Nparcel T1250 format
* new method translate() to translate source record into Nparcel T1250
  format
Merge branch 'dev' of https://github.com/loum/nparcel into dev
Merge branch 'feature/us-npe-mapper' into dev