* Fixed mini-gun physics exploit

This was the coolest most unexplainable exploit. If you melee'd the hell out of the minigun and then jumped on top of it, it would catapult you across the map. Very interesting way to get past the forklift mob choke point.

* Fixed several map exploits

I believe this is the ability to break down the metal doors at the warehouse mob point ("Get on the Lift!"). And possibly another tweaks to the rocks at the boathouse finale. I need to confirm this one as the rocks were the best place to be!