WIP
WIP
WIP
Added scene tests
Modified tests
Merge branch 'master' of https://github.com/PythonDynamics/pydy-viz into extend-visualization-frame-tests

Conflicts:
	pydy_viz/tests/test_visualization_frame_scene.py
Merge branch 'Scene-class'

Conflicts:
	pydy_viz/scene.py
Modified some scene tests, all tests pass