账号的权限没有问题，但是commit时报出如下错误：
Description : You are not authorized to access the files in the repository.
Suggestion : You might be required to provide a user name and password when prompted before being allowed to access the repository.
Description : Commit failed (details follow):
Status : 175013
Description : Access to '/svn/Vien.IOSapp/!svn/me' forbidden
Status : 175013
当时遇到这个问题，花费了很长时间，后来才发现是钥匙串Keychain中密码失效的问题，要在钥匙串访问的密码选项中把svn的密码清除，然后在svn中重新输入密码即可
