remove no more needed returning of the class constructor at end of class files

runtime.loadClass(...) no longer expects that eval(fileContent) yields
the constructor, and a few loaded files rely on that (e.g. all singletons/namespaces),
so let's be consistent
Merge pull request #606 from kossebau/removeNowUnneededClassReturning

remove no more needed returning of the class constructor at end of class files