Beware The Rock Grinder

Just added level 5, which is my most ambitious level yet. It includes three new game objects

1. Boulder Chutes - produce boulders
2. Conveyor Belts - transport boulders to grinders
3. Boulder Grinders - destroy boulders into cobbles and then dust

Getting the spinning grinder blades to work was probably the most challenging with the matter.js constraints. But, I think it turned out pretty nice. And now I have a bit more to put into future levels.

- Fractalus