Add LaTeX cruft files to ignore list
Add lecture notes to project

Imports LaTeX versions of my 671 lecture notes to give the project
it's *preliminary* content.
Remove phony dep from LaTeX compilation path

The Makefile used a phony target to delegate the decision about
whether or not the pdf files needed to be rebuilt to latexmk.  This
takes a while, so I'm putting that decision back in the Makefile.
Bump version number
Merge branch 'dev'