vcs: Add details about -u, -m parameters to commit Changes correspond to changes made to handout in previous commit.

vcs: Introduce commit with -u and -m parameters commit is now introduced with -u and -m parameters. This fixes a couple of problems -- 1) hg sometimes doesn't allow commits without username 2) vi(m) is the default editor -- most people can't use it (yet).

vcs: Fix tiny indentation problem in handout.

vcs: Add include directive for exercises in handOut.

vcs: Fix pygments highlighting of code blocks with $ and ' Pygments highlighting breaks when a code block ends with a lone $ on a line or when it has an unmatched '.

vcs: Add highlight directive to handout.rst Sphinx uses highlight directives, which can be passed on, to Pygments for syntax highlighting.

vcs: Fix problem with typesetting a code block.

vcs: Make exercise.rst more detailed. The students were a little confused, because they didn't have an idea of the big picture. Added more detail, attempting to show the big picture.

vcs: Fix errors in slides, after class. The 3 pane diff description was wrong. Changed it.

vcs: Change \title in vcs.tex. The title is now more specific, rather than generic. It mentions hg as the version control system being used.