Revert "Added RegularPolygonVisual and example, updated EllipseVisual and made PEP8 compliant"

This reverts commit 3c00645d6adef9e357a3f70c88116685e744a4da.
Revert "Simple test for PolygonVisual"

This reverts commit 9c5964cc7a8bea7bbbd2db7c78f2b20b160722c6.