Bug 176882 [DataBinding] Create SWTObservables.observeEditable(...)
We need to provide an observable for the editable property of Text.
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/swt/SWTObservables.java
/**
	 * @param control
	 * @return an observable value tracking the visible state of the given
	 *         control
	 */
	public static ISWTObservableValue observeVisible(Control control) {
		return new ControlObservableValue(control, SWTProperties.VISIBLE);
	}
	/**
	 * @param control
	 * @return an observable value tracking the tooltip text of the given
	 *         control
	 */
	public static ISWTObservableValue observeTooltipText(Control control) {
		return new ControlObservableValue(control, SWTProperties.TOOLTIP_TEXT);
	}
	/**
	 * Returns an observable observing the selection attribute of the provided
	 * <code>control</code>. The supported types are:
	 * <ul>
	 * <li>org.eclipse.swt.widgets.Spinner</li>
	 * <li>org.eclipse.swt.widgets.Button</li>
	 * <li>org.eclipse.swt.widgets.Combo</li>
	 * <li>org.eclipse.swt.custom.CCombo</li>
	 * <li>org.eclipse.swt.widgets.List</li>
	 * <li>org.eclipse.swt.widgets.Scale</li>
	 * </ul>
	 * 
	 * @param control
	 * @return observable value