Tweaks to chute rendering

+ laser block rendering clean up (no noticeable changes)

Could probably make the chute look a lot better (like actually have a hole on the top) but I was thinking... Why is the chute still a thing? Hoppers are vanilla and work a lot better than them (since they can insert items to the sides as well)...

Here's what it looks like now:
![screen shot 2014-12-17 at 17 40 20](https://cloud.githubusercontent.com/assets/5294529/5477641/478ccf54-8614-11e4-8d38-ceff4a282444.png)