客户端Json处理类

加了Json处理类
Merge remote-tracking branch 'origin/master'

Conflicts:

	Android_Client/SecondHandPlatformClient/bin/SecondHandPlatformClient.apk
	Android_Client/SecondHandPlatformClient/bin/classes.dex

	Android_Client/SecondHandPlatformClient/bin/classes/zju/secondhandplatform/client/Home.class
	Android_Client/SecondHandPlatformClient/bin/resources.ap_