fork => clone

By "forking" I think we mean "cloning" in GIT. Forking has espceiclly a
different meaning on Github, and I don't think that's what we are
referring to here.
Merge pull request #10 from JensRantil/fork-to-clone

fork => clone
clustering in chp3
adding a style hack
cosmetic changes
cosmetic changes
fixed mathjax bug in chp1 and 2
added data
ch2 edits + 1 style change to h4
chp3 cluster example
readme typo
Update README.md
chp3 additions to MAP
rating example
Update README.md
cleaning up chp2
Merge branch 'master' of github.com:CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers
Update Chapter1_Introduction.ipynb
rolling back chp1, the bad way
adding sandbox; moved chapter 10 to sandbox; created example from stackexchange