-Updated to add two extra properties cellZoomXOffset and cellZoomYOffset to allow you to customise the initial X and Y positions of the cell before it animates, to allow you to have effects like coming in diagonally from the bottom (like the latest release of the Google+ app does!). The default for both is 0.
-Added a new demo to the demos code (TabThreeViewController) to demonstrate this new property.
-Added extra comments to document what each demo does, and the default values of the properties.