Add pdf flag latex example in README
Move to 'report' style and make many cosmetic changes

- Switch to the default report class (fell out of love
  with tufte-latex)
- Add hanging bullets with enumitem.
Merge branch 'master' into lists

Conflicts:
	AUTHORS.tex
	LICENSE.tex
	core_econometrics.tex
	regression/problems.tex
	tex/preamble.tex