Wikipedia says that Raspbian doesn't package Firefox/Iceweasel, but a
much more lightweight web browser called Midori.  Updated script to run
midori instead of firefox, updated debian/control to depend on the
Midori package.

References:
    https://en.wikipedia.org/wiki/Raspbian
    http://packages.debian.org/wheezy/midori

Signed-off-by: The Doctor <drwho@virtadpt.net>