Changed FLA Example, FloorAd Alignment

Added bottom alignment of the_bottom container.
When the movieclip is bigger than the _bottom container if have issues
in the alignment of the _bottom itself
Bar Y position, getters and setters for floorad

Solved Floorad barPosition in Y axis
Now set it as instance.barPositionY=value
if null the value will take the stageHeight - instance.height.

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Added setters and getters for FloorAd
Now overrides the realign method in Container.as
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