Deprecate CompositeIterator in favor Spring core.

Deprecate existing class and refactor internal code to use the org.spring.util version that 
has been available since Spring 3.0

Issues: SWF-1532

spring-binding/src/test/java/org/springframework/binding/collection/CompositeIteratorTests.java

@@ -27,6 +27,7 @@ import junit.framework.TestCase;
  * 
  * @author Erwin Vervaet
  */
+@Deprecated
 public class CompositeIteratorTests extends TestCase {
 
 	public void testNoIterators() {