fixed buggy latex in chapter4
changed title, and edited finance example
rm MacOS X cruft and .gitignore it
typo: s/Prolouge/Prologue/g
Merge pull request #4 from larsmans/fixes

Fixes
cheating ex for chapter 2
Merge branch 'master' of github.com:CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers
adding author
changes to chp2/chp3 example
readme
edits to chp2
mountain example to chp3
chp3
chp3 work
chp3 loss
README.md
fixed font  size in ch2, add lis.
Minor editorial tweaks

Spelling corrections, deleted a stray word here or there, very minor
sentence restructuring in a few places.
Editorial tweaks, chap 2, pt 1

Minor spelling and grammar corrections, a few rewordings, etc...
readme pymc