Add script tags to index.html

This is roughly equivalent to the commit in the original Roostagram that
can be found here:

https://github.com/bocoup-education/roost-chicago-2014-app/tree/6835dcaff8c83a27d0b081dfc8ad7b58bef5aee9

Left out the changes to the "connect" web server since I'm not using it
here.