Disable adding axes in examples

[Gillaugh]

In [3]: examples.BeamExample()
---------------------------------------------------------------------------
Exception                                 Traceback (most recent call last)
<ipython-input-3-f6334ffa27c4> in <module>()
----> 1 examples.BeamExample()

~\AppData\Roaming\Python\Python36\site-packages\vtkInterface\examples\examples.py in BeamExample()
    117     plobj.AddMesh(grid, scalars=d[:, 1], stitle='Y Displacement',
    118                   rng=[-d.max(), d.max()], colormap=colormap)
--> 119     plobj.AddAxes()
    120     plobj.SetCameraPosition(cpos)
    121     plobj.AddText('Static Beam Example')

~\AppData\Roaming\Python\Python36\site-packages\vtkInterface\plotting.py in AddAxes(self)
   1286     def AddAxes(self):
   1287         """ Add axes actor at origin """
-> 1288         raise Exception('Disabled')
   1289         pass  # causes segfault
   1290         # axes = vtk.vtkAxesActor()

Exception: Disabled

[akaszynski]

Fixed in 0.8.1