Added log.txt to .gitignore
Added ArcBall object
Added arc ball dragging calls
Disabled pre-arcball rotation
Basic mouse drag and rotate working

Need to implement gestural rotation
Added control by secondary hand.

Instead of mouse dragging can now use secondary hand. Similar to old
rotation.  Increased arc ball radius.
Added control of rotation from 'R' key back

Cleaned up old commented code.
Added front right and top views.
Moved ArcBall and Quaternion classes into sketch

This is a a temporary fix to avoid using the new library until the
reset of the code can be cleaned up. Allows arc ball rotation.
Merge branch 'arcBallIntegration'