[ci] run morse test w/xvfb

- revert to blender 2.64 w/python3.2.3
  to sync with system's python3 version.
- NOTE: increase color depth to 16,
  the default 8 bits is not enough for OpenGL.

Thanks to Séverin Lemaignan for his help!
[pymorse] Updated setup.py before releasing to pypi