Changed hump submodule to download using https

...so I can get it through restrictive proxies that won't let me
use the git:// protocol.
Temp-fixed bouncer double collision

Now, the bouncer projectile won't collide with the same object twice in
0.08 seconds. It's hacky, but it's hardly noticable.

If I think of a better way to do this, I will implement it.