Merge pull request #12 from mikem5/master

chapter 8, 12,13,16,17,18
added 8.3 and 9.1
Added 8.09, 9.05, and 9.21.  Also, there is an alternate version of 8.03 that was added (by accident?); someone should look at which is better and remove the other one.
corrected syntax and removed pdfs for hand-written solutions.
used version 2 for 08.03 and did cleanup on others