Made Hero die when touching ABYSS tiles too
Added Bubble Man tiles and map, also Pearl man
Added basic rate limiting via Shot tracking
Fixed ladder transitioning problem

Now Hero keeps track of the ladder he's on -- if he's climbing and is
intersecting another ladder then it is assumed that the ladder is
connected and he mounts on to it.
Started implementing variable gravity
Enhanced bubble man tiles and stage
Now updating tileset (in case it has animations)

During gameplay the animated tilesets will... be animated.
Water physics implemented for Hero

It's REALLY close to the underwater physics in Mega Man 3 -- even when
jumping through the surface of the water. It's off by 1 pixel X_X.
Added test map with water physics
Cleanup + small Hero bugfix

Fixed warnings from GCC; small bugfix in Hero so that he can't shoot
while sliding.
Merge pull request #109 from zackthehuman/master

Death from abyss, weapon rate limiting, ladder bugfix, some cleanup, Bubble Man stage, and water physics