pyassimp examples

• sample.py: shows how to load a model with pyassimp, and display some statistics.
• 3d_viewer.py: an OpenGL 3D viewer that requires shaders
• fixed_pipeline_3d_viewer: an OpenGL 3D viewer using the old fixed-pipeline. Only for illustration example. Base new projects on 3d_viewer.py.

Requirements for the 3D viewers:

• pyopengl (on Ubuntu/Debian, sudo apt-get install python-opengl)
• pygame (on Ubuntu/Debian, sudo apt-get install python-pygame)