Cow Pasture 畜牧产肉和皮革
1.增加两个牧场，一个产肉，一个产皮革。使用方法类似农田，不过原料补给换成了小麦而不是水。
2.牛成熟后，小人会用斗牛士的姿态收获皮革和生肉。
使用方法：在“farming”或“里研究畜牧，然后即可建造.
目前牛的外观不是太好看.
2019/3/21更新：改进牛的外观，一点点.
2019/3/22更新：适当上调产率，并且产出效率不受肥沃度影响
2019/3/24更新：将皮革产出改为动物皮
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1. Added two type of pastures: One produces raw meat while the other produces leather. Unlike cotton farm, you should have to feed the cows wheat instead of water.
2. As soon as the cows grow up, you can let your character harvest their Flesh Meat and skin by using a bullfighting action, automatically.
How to use: research "pasture…" in "farming" catageory, thus you can build them.
P.S: the cows seem to be wooden now, I will improve that later time.
changelog：2019/3/21： The cows look more natural now, a little.
2019/3/22： Increased the producing efficiency . The output rate is no longer related to the ground fertility now.
2019/3/24： Make the "leather farm" produces animal skin instead of leather. It seems more resonable now.
