CS240:  Some small formatting changes

Mostly \left( \right) instead of \big( \big)
when it looks better, and also \cdots over \ldots when
continuing an sum.
Merge pull request #5 from tbelaire/small-fixes

CS240:  Some small formatting changes
CS 240: minor language fixes, and fix for boogie down process.
Merge branch 'master' of github.com:christhomson/lecture-notes

Conflicts:
	cs240.pdf
CS 240: minor fixes (RSD -> MSD, "numbers numbers").
CS 240: fixed typo "fix your tree" => "fix your tree."
Changed link colors to be less bright.
Updated .gitignore to exclude latexmk files.
CS 241: added February 27, 2013 lecture.
CS 240: fixes various typos as discussed in #8 (thanks Jason).
MATH 239: added February 27, 2013 lecture.
MATH 239 [Feb 27]: separated Hamiltonian cycles into a subsubsection.
PSYCH 207: added February 28, 2013 lecture.
CS 241: fixed typo ''setchar'' -> ''getchar'' (thanks Xenia).
CS 241: added March 1, 2013 lecture.
CS 241: fixed typos outlined in issue #11 (thanks Jason).
MATH 239: added March 1, 2013 lecture.
CS 241: fixed two's complement little-endian example.
CS 241: a bunch of minor fixes.
CS 241: rephrased getchar/putchar explanation so it's consistent.