Colossal Cave Adventure web port version 0.10

I've updated my Colossal Cave Adventure JavaScript port. It fixes a few bugs related to the Plover room, but probably more importantly, adds the ability to save the game. Save games are done by creating a new link that can be bookmarked. The URL can be loaded in order to restore the game to whatever state it was at when the game was saved. (Probably.) Note that save games may not continue to work with never versions of the game and are still somewhat untested, but they were enough to allow me to sort out the problems with the Plover room without having to run through the game up until that point every single time.