FIX: RenderedString on Window was not invalidated when using appendText and insertText functions.  See: http://www.cegui.org.uk/mantis/view.php?id=382.
FIX: RenderedString on Window was not invalidated when using appendText and insertText functions.  See: http://www.cegui.org.uk/mantis/view.php?id=382.

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branch : v0-7

cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two