Removed proceduarl_face and replaced different_face_ideas with better image that shows all 24 faces.

Removed wait_time and other unnecessary timing variables. Changed next_face to current_face. Added eye_position and openface_implementation methods. Timing of interploation now consistent with different width and height - still not consistent with different elapsed time. Changed display_all_faces so that it works.

Renamed get_next_frame to run_expressive_eyes and added new method called get_next_frame to tidy code in face_manager. Changes in demo.py reflect this change.

Changes to face.render function to accommodate new width and height parameters that are taken by the pycozmo proceduralface function.

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