v0.6.1

• add support for lineCap, lineJoin, miterLimit, globalAlpha, globalCompositeOperation, filter, imageSmoothingEnabled and imageSmoothingQuality
• fix a bug in the handling of a saved state
• fix three bugs related to the rendering of shadows
• fix a bug in putImageData()
• fix bug related to stroked paths
• fix a bug related to drawing lines to infinity with shadows