new Canvas class to decouple layer and canvas, providing more flexibility. drawing operations now require a canvas object rather than an optional layer which contained a canvas. fixed some transformation issues introduced with a pull request that I pulled in last week

tests/js/functionalTests.js

@@ -152,7 +152,7 @@ Test.prototype.tests = {
                 context.quadraticCurveTo(300, 100, 260, 170);
                 context.closePath();
                 context.fillStyle = 'blue';
-                context.fill();
+                context.fill(context);
             },
             draggable: true
         });