This patch adds a check for updates feature.
It connects to http://subsurface.hohndel.org/updatecheck.html to check for
any new versions. It then prompts the user with a download link if an
update is available.
Signed-off-by: Joseph W. Joshua <joejoshw@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
