Added unit tests for jquery.rectUtils.
Renamed tutorialOverlayArrow -> tutorialOverlay.Arrow and
tutorialOverlayTip -> tutorialOverlay.Tip
Modified gruntfile to use newly renamed Arrow and Tip files.
Made all properties of Arrow private.
Added getters for size, padding, direction.
The entire rendering code can use a custom drawing function.
Added JSDoc comments to Arrow functions.
Adding initial Arrow unit tests.
Added more JSDoc comments.
Added more Arrow unit tests.
Added JSDoc-style file overview.
Moved some code around in Arrow tests.
Refactored jquery.tutorialOverlay.Tip to make it more OO.
Added tutorialOverlay.Tip unit tests.