qt5 not supported for rviz_python_tutorial

[dhood]

This probably hasn't worked since kinetic

It will give:

$ rosrun rviz_python_tutorial myviz.py 
Traceback (most recent call last):
  File "/opt/ros/kinetic/lib/rviz_python_tutorial/myviz.py", line 26, in <module>
    class MyViz( QWidget ):
NameError: name 'QWidget' is not defined

[William Woodall]

Closed by #41