android—— eclipse打包apk

参考：
http://blog.csdn.net/fufengrui/article/details/8536503
已经生成了keystore：
http://pan.baidu.com/disk/home#list/path=%2F%E5%90%8E%E6%9C%9F%E5%AE%89%E5%8D%93%2F%E6%89%93%E5%8C%85%E6%88%90apk%E6%89%80%E9%9C%80keystore