Draw2D touch version 4.7.0 released

+ new kind of figures: composite. The first implementation of these kind are "draw2d.shape.composite.Raft"
+ fixing IE10 png export issue
+ new example for the first composite shape: "composite_raft"
+ new method "Class.inject" for plugin and painless draw2d method overriding/replacement
+ delete the Canvas.onKeyUp method and replace them with a policy. Keep in mind that overriding the onKeyDown method didn't work anymore. You must install your new KeyboardPolicy or uninstall the existing with "canvas.uninstallEditPolicy( new draw2d.policy.canvas.DefaultKeyboardPolicy());"
+ new policy draw2d.policy.canvas.KeyboardPolicy and draw2d.policy.canvas.DefaultKeyboardPolicy