Log Message:
Update to 4.5. Major new features are:

* support for Python v3
* support for Qt v4.5.1
* added the QInputContextFactory class
* a new, more Pythonic, API has been added for connecting signals and slots
  which does not require knowledge of C++ data types
* new signals can now be defined using pyqtSignal as a more Pythonic
  replacement of the __pyqtSignals__ class attribute.
* added the pyqtSlot decorator as a more Pythonic replacement of the
  pyqtSignature decorator
* the "type" argument to pyqtProperty() can also be a Python type object
* the "type" argument to Q_ARG() can also be a Python type object
* the "type" argument to Q_RETURN_ARG() can also be a Python type object
* added QT_TR_NOOP_UTF8()
* super() works without restrictions
* replaced the old qtdemo example launcher with a port of the newer version
* added the editabletreemodel.py and fetchmore.py examples
* replaced the old tutorial with the newer Address Book tutorial.