standardize noreferences.py

- NoReferencesBot extends pywikibot.Bot
  with options as a dict, and standard 'always' switch

- use the inherited self.userPut(), removed the save() method

- let the standard GeneratorFactory parse the '-namespace:' argument

- fix some pep8 errors
  E265 block comment should start with '# '

Change-Id: Iae38e6ba582e5e65f38290d34d3048cf1442c383
Merge "standardize noreferences.py"