Warning: call-time pass-by-reference deprecated

I can't find any reference to this in the issue queue so I though I'd add it as it may help somebody.

If you're getting warnings like these:

Call-time pass-by-reference has been deprecated; If you would like to pass it by reference, modify the declaration of call_user_func(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. in ******/skinr.module on line 445

These have been fixed in the development version but are still appearing in the latest release.

To fix upgrade to the latest dev release.