Fix bug chenfanfang#45 chenfanfang#46 chenfanfang#51 (NSMutableDictio…

…nary Set nil Object will Crash.)

注释小修改

对unrecognized selector sent to instance的优化处理

edit readme

update

小修改

换种方式实现对unrecognized selector sent to instance 异常的捕获

换种方式实现对unrecognized selector sent to instance 异常的捕获

Update

完善功能