Added some tests for VisualizationFrame class
WIP
Added transform tests for visualization frames
Added class for visualization frame tests
Modified some tests
Added tests for nesting, equalities and for un-named VisualizationFrames
Added unnamed classes tests
Added equality/inequality tests
PEP8
Merge pull request #6 from tarzzz/tests-shapes

Tests shapes
Added tests for a Camera
Removed equality/inequality tests
replaced equalities with *is*
Merge pull request #4 from tarzzz/tests-visualization-frame

[WIP] Added some tests for VisualizationFrame class
Added some scene tests
Removed some pep8 errors.
Merge pull request #7 from tarzzz/tests-scene

[WIP]Added some scene tests, merged to modify the directory structure.