Altered dungeons to a). center on the player, and b). remove the
borders.  This allows you to see adjacent dungeons that you've explored
(neat), and gives a much larger sense of the dungeon.  This will also allow
for generation of multi-chunk dungeons without having awkard transitions.
In the canvas and the chunk, there are several lines which I commented out.
Play around with this a bit, and if you don't like the changes then put them
back in.

However, this also made me painfully aware that many of the chunks are generating
exactly the same.  This is obviously a problem.  I have an idea as to why this might
be happening, but I'm not entirely sure...I'll see if I can fix it.
Merge branch 'master' of https://github.com/schiem/roguelike

Conflicts:
	src/gui/game.cpp