Merge pull request #21 from sarabander/master

Most of the Ch. 1 footnote markers tagged
changed license text a bit
cosmetic changes
Cleaned up code
Merge branch 'master' of https://github.com/zodiac/appspot-grading
add navlinks to top
Merge branch 'master' of github.com:zodiac/appspot-grading
rest of section 1.1 footnotes added