bugfix:DUBBO-628
Merge pull request #3 from wangchangbing/master

admin项目订阅zk时当interface包含内部类$字符时出现问题
add ProtectionDomain for dynamicly created class
DUBBO-635 JValidator在类名生成的类名有$，有frozen class异常
DUBBO-625 业务对象的toString方法异常会导致RemotingInvocationTimeoutScan失效
set ProtectionDomain for newly generated Class
DUBBO-636