Merge pull request #3 from chchiou/Yilin

Apply Yilin/src to Master/src
Merge pull request #4 from chchiou/Yilin

Yilin
Merge pull request #7 from chchiou/Yilin

merge to master
Update RabbitsGrassSimulationAgent.java
Update RabbitsGrassSimulationModel.java
Merge pull request #6 from chchiou/master

Balance Achieved