Adding *.tex files for the instructor's guide from Fall 2013.
Adding files for the crane figure in the Instructor guide which were
accidentally not originally included.  These are the same as the "crane.*"
image, just with a different name so as to not mess up the .tex file that
they are referenced from.
Merge pull request #2 from jbuncher/add-instructor-tex-files

Adding *.tex files for the instructor's guide from Fall 2013.