scrolladv包内无必要的类不对外公开,删除参考文件ScrollAdvOld.java
去除心跳线程类的Log,加入广告点击监听器,加入生命周期回调,使广告播放状态能保存  onSaveInstanceState(Bundle
outState)
  onRestoreInstanceState(Bundle savedInstanceState)
添加注释
支持在xml中配置scrolladv的加载中和加载失败图片