Week04 - WSGI Server

Hi Cris,

I know there's a lot of files in this pull request, please disregard any not in the week04 folder--none of the other files are in a state to be turned in.  If I do revisit the Jeopardy stuff from week03, I'll include that in a different pull request.  I've included both my first rough cut at the WSGI server, and then a more refined version based off of the blog post we were supposed to look at.  The first attempt is: bookdb_wsgi_server.py and wsgi_book_server.py is what's currently running on my VM.  Thanks for your feedback.

--Will