updated Canvas docs
updated Shape and Wedge docs
updated stage docs
updated readme and Animation docs
added counter pixel ratio method so that drawings aren't double scaled when using toDataUrl and toImage
cleaned up docs, and beefed up individual shape docs.  moved corner radius attr to Rect shape
drag and drop operatons now dynamically generate a temporary top layer for high performance drag and drop.  When completed, the top layer is removed.  Also cleaned up a bit of drag and drop logic
leveraged new eachAncestorReverse() method where possible
flattened shadow object into shadowColor, shadowBlur, shadowOpacity, and shadowOffset attrs
fixed up group drag and drop
updated unit tests with new shadow API
huge changes to Text shape.  Skinnied it up by removing rectangle rendering component.  textFill is now fill, textStroke is now stroke, textShadow is now shadow, and textStrokeWidth is now strokeWidth
cleaned up Path docs
new spline attr for the Line shape which enables splines
decided to make an actual Spline shape.  Will create a Blob shape soon, which will be an enclosed spline
improved Spline docs
added new Blob shape.  removed double quotes from all shapes.  made it easier for shapes to extend other shapes
updated readme
added more blob unit tests
Text fontSize unit is now in pixels (used to be points).  Default text lineHeight attr is now 1 (used to be 1.2)