task/ta-npi-016-05 -- refactor the table_column_map() method
so that the 'default_equal' rule is processed separately

nparcel/utils/log.py
* adjust logger_name to handle logging when used with the Python
  interpreter
* patched issue with setting the logging when overriding the root
  handler

nparcel/loader.py
* refactored the table_column_map() method so that each processing
  step exists in separate method
* new methods set_callbacks(), set_defaults(), set_default_equals()
  and set_columns()