Cubes!

I added cubes to worldedit. As well as a helpful command, platfrom. This feature have been both tested farelly well in only bukkit. I add a new configuration feild for cubes because going off MaxRadius didn't seem to make sense. Also adding the raise flag for pyrmids. Note this commits might not look right because I kinda suck at using git but I am getting better. 
This should be 
````java
public class HollowCubeBrush implements Brush {
````