add: clear, throw exception

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add: Sockets

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add: 增加sdcard工具类
	new file:   src/cn/edu/hust/cm/common/util/SDCards.java
add: 补充条件判断方法
	modified:   src/cn/edu/hust/cm/common/util/Conditions.java
add: 几个in方法
	modified:   src/cn/edu/hust/cm/common/util/Vectors.java
add: 增加方法用于读取 mcc, mnc

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mod: 修改方法签名

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add: choose 方法

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add: 获取当前连接上的ap的mac

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add: 将 mac 地址转换成 long

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add: math

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add: 用于处理 double 的 between 方法

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add: 一个易用的构造 set 的方法

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add: isDataConnected2

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