remove QiniuException
捕获异常，回调到onFailure中
捕获异常，回调到onFailure中
Merge pull request #65 from simon-liubin/update/rm-QiniuEx

remove QiniuException
merge from 65
Merge pull request #66 from simon-liubin/update/check-ex

捕获异常，回调到onFailure中