Initiated VisualizationFrame class
WIP
VisualizationFrame complete, except docstrings
Added Docstrings
Updated Docstrings
1) Removed delete frames method
2) changed __init__ method
3) wrote some docstrings
Changed some imports, and modified according to PEP8
Added PerspectiveCamera class
Updated PerspectiveCamera
Updated PerspectiveCamera
Added OrthoGraphicCamera
Removed Camera from visualization_frame.py
Some minor corrections
Some changes in visualization frame
Modified docstrings, made all transformation related attrs. private.
Merge pull request #17 from tarzzz/VisualizationFrame-class

Visualization frame class