Issues: https://github.com/alibaba/arthas/milestone/7?closed=1
#851 fix jad command do not work under JDK 6/7
#855 alert error message when webconsole connect error
#857 Upgrade cfr to 0.146
Issues: https://github.com/alibaba/arthas/milestone/7?closed=1
#851 修复jad命令在 JDK 6/7下不工作的问题
#855 在webconsole上连接出错时，弹出提示框
#857 升级 cfr 到 0.146