Adding support for Cactus and Sugar Cane

Small change to allow Cactus and Sugar Cane to grow also added Config
option for limiting the growth of Sugar Cane and Cactus, this is true by
defult meaning that the Sugar Cane/Cactus will grow no more than 3
blocks high
Merge pull request #1 from FalconPyro/master

Adding support for Cactus and Sugar Cane