Updating assignment 7 & moving assignments to gh-pages

@bakercp, two things:

- Some of the PRs that were merged in had student projects on the master branch.  I'm moving them to the gh-pages branch
- I updated assignment 7 with some additional information for how/where to read the graphics chapter of ofBook.  The HTML version is vaguely prettier/easier to navigate with the table of contents.

(Sorry for the excessive number of commits, forgot that I used this fork of the repo for ofBook hosting early on.  Should've started with a clean fork of your repo.)