Minor changes to chapter's 1-4.  Moved around distance problems in vector chapter.
Changed wording on one problem in 4. Minor edits to 5.
added reference in problem 108 (and fixed typo). Removed pdf file from commits
Updated Motion unit drastically.
removed 10-12 to make the merge easier.
Merge branch 'master' of https://github.com/jasongrout/multivariable-calculus-IBL.git
Minor changes to multiple files.  These are mostly typo changes. I have been working on all files at the same time.
A few more minor tweaks to the files.  Added some notes and hints to a few problems.
Slight mods to 9 and 10. Rewrote Review unit with high dimensional approximations.
Modifications made through midterms in Fall 2012. Changes made to make class flow more easily.
Fix 3 typos
Merge pull request #1 from jasongrout/ben

Fix 3 typos
Updating files from fall 2012
Reset my customizations
render up to chapter 2
Completely rewrote the derivatives unit to develop the entire chapter from the context of implicit differentation and differentials.
Put the two more theoretical problems into a note rather than just commenting them out.
Merge
Fix typo
Change order of chapters slightly