API addition to SplitPane

[Kinsley Wong]

The Controls team would like to add the following new api below to SplitPane

    public static void resizableWithParent(Node node, Boolean value);
    public static Boolean isResizableWithParent(Node node);

resizableWithParent(Node node, Boolean value) will set a Boolean property on the node. If the Boolean value is false the panel will not be resized when the SplitPane is resized. By default all panels in a SplitPane are resized when the window is resized.

http://javafx-jira.kenai.com/browse/RT-18806