Added abiliy to grow in both directions up to a max. #8
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The GrowingPacker can now add elements that exceed both the width and height of the root container. It does this by replacing the root with a new root whose (x,y) origin points at the newly added space.
This breaks the assumption that the (x,y) origin is always at the top-left of each node. Instead, the (x,y) origin is always somewhere within the node. Of course, the width and height still always represent the total area "owned" by each node. This has been used to terminate the "fits-inside" traversal early by skipping dead-ends when a node is smaller than the new element to add.
Finally, the growing packer demo has been changed to grow up to the max width and height available to the canvas area.