Move R code out of bayesian tex file into R files
Add bayesian references
Reorganize regression content
Edit material on conjugate priors
consolidate statistics material into a few chapters
Rename parts 3 and 4
Reorganize regression material again
Change name of regression section
Add QED symbol to the end of questions and examples and change numbering for theorems
Tweak URL formatting

- Adds a quote-style '<' and '>' to urls.
Rewrite Bayesian Metropolis-Hastings material

- Rewrite the text as prose instead of an outline
- Remove R code
- Update makefile