Fix abstract types

Thanks for fixing my pull request https://github.com/wsdl2phpgenerator/wsdl2phpgenerator/pull/152.
I've tested the new release and found a bug there again. The first parameters of calling should be parent ones. We can't put a parametres at the end because there'll be mismasch with params ordering.

I've improved tests (AbstractTest). It works now and testing the parameters ordering. I've removed testing abstract modifier. It's issue https://github.com/wsdl2phpgenerator/wsdl2phpgenerator/issues/123.