new_contents: #!/usr/bin/env python3
  
  # Copyright (c) 2014-2015, Ruslan Baratov
  # All rights reserved.
  
  from os.path import abspath, dirname, join
  exec(open(join(dirname(abspath(__file__)), 'polly.py'), 'r').read())
  
subject: Add build.py for backward compatibility.