Update jquery link in index.html

added full http:// path to link.
My main problem was that I opened index.html directly instead of via localhost:8000 from server.py.  When I open via server.py, it does not generate a JavaScript error.  So the python library "BaseHTTPServer" includes jquery (or an emulation of it)?  There is an error output by server.py which is probably related to this line:
     ```127.0.0.1 - - [04/Dec/2014 12:16:33] code 404, message File not found```
(viewable in the command-line console output from server.py)