Lua pinetree generation and sapling growing ABM. Cleanup file. Pointy top?

![screenshot_346806125](https://cloud.githubusercontent.com/assets/3686677/5296463/1a7042b2-7b9c-11e4-8e14-9bff9b176682.png)

I added a pointy top, what do you think? Also, the trunk extends 4 nodes down into the ground as a simple root.