improvments on getClass() method
I am targeting this branch, because the issue (loops in our phpcr admin) occurs on this branch.
Markdown ### Changed - Improvements on `AbstractAdmin::getClass()` method
I faced some loops in our phpcr admin imlementation casuse we used
getClass() method in ourAbstractAdmin::getSubject()` implementation, cause getClass() calls getSubject() again. We had to solve our issue in our code, but here are some fixes to make the code consistent to the doc block information.