Qt.py

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* use qmake with QT_SELECT since qmake-qt4 is not available on all platforms (`22 <https://github.com/ros-visualization/python_qt_binding/issues/22>`_)

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* support PyQt4.11 and higher when built with configure-ng.py (`13 <https://github.com/ros-visualization/python_qt_binding/issues/13>`_)
* __builtin__ became builtins in Python 3 (`16 <https://github.com/ros-visualization/python_qt_binding/issues/16>`_)

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* add Python_ADDITIONAL_VERSIONS and ask for specific version of PythonInterp
* fix finding specific version of PythonLibs with CMake 3 (`11 <https://github.com/ros-visualization/python_qt_binding/issues/11>`_)
* fix sip_helper to use python header dirs on OS X (`12 <https://github.com/ros-visualization/python_qt_binding/issues/12>`_)

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* fix sip arguments when path contains spaces

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* python 3 compatibility
* fix sip bindings when paths contain spaces (`9 <https://github.com/ros-visualization/python_qt_binding/issues/9>`_)

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* allow overriding binding order
* allow to release python_qt_binding as a standalone package to PyPI (`5 <https://github.com/ros-visualization/python_qt_binding/issues/5>`_)