My changes to PythonQt

Hello Orochimarufan,

I've tried to merge all my changes to PythonQt into your fork.
These contain mostly support for python-docstrings (can be generated using decorator functions, see PyExampleDecorators) and some adjustments to the qmake-project files.

If you could merge the changes we may ask Florian Link if he reintegrates them into the official PythonQt as I would prefer not to maintain my own version of PythonQt.

I've also tried your CMake-build system with qt4/5 python2/3 and it works like a charm.

Regards,
Melven