add: log service

Signed-off-by: 410063005@163.com <410063005@163.com>
add: NotificationUtils
	new file:   src/cn/edu/hust/cm/common/app/NotificationUtils.java
	new file:   test/src/cn/edu/hust/cm/common/util/NetworksTest.java
add: Pools
	new file:   src/cn/edu/hust/cm/common/util/Pools.java