Added a #define to turn cubic pacing on or off.

Added Erica Sadun’s Catmull-Rom path smoothing to draw curved path if cubic pacing is selected.

Added a bug fix to Erica’s Catmull-Rom path smoothing UIBezierPath category.
Added comments to Erica Sadun’s Catmull Rom code to show the bug fix more clearly. Changed #define commands to log keyframe steps.