Factor graph and loopy belief propagation in Python

• graph
• bp/lbp
• repo structure
• tests
• viz (another repo)
• cleanup (pep8, requirements.txt, use logging lib, etc.)
• CI
• Readme
  • figure out good structure for this. also don't forget:
  • BP tutorial link
  • note pyfac for inspiration and test help
  • installation
  • examples
  • viz pic + link
  • future work: API cleanup, timing and optimization, optional logging
  • projects using this