added SimpleTrafficLightsSample

refs 1389

org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/internal/ElementCompositorService.java

@@ -22,6 +22,7 @@ import java.util.List;
 import org.eclipse.emf.ecore.EObject;
 import org.fortiss.tooling.kernel.extension.IElementCompositor;
 import org.fortiss.tooling.kernel.extension.data.IElementCompositionContext;
+import org.fortiss.tooling.kernel.extension.data.ITopLevelElement;
 import org.fortiss.tooling.kernel.extension.data.Prototype;
 import org.fortiss.tooling.kernel.model.ILibraryElementReference;
 import org.fortiss.tooling.kernel.service.IElementCompositorService;