Make use of Java 5 auto boxing

Reviewed and replaced when possible:
- new Integer
- intValue()
- new Boolean
- booleanValue()
- Boolean.TRUE
- Boolean.FALSE
- new Long
- longValue()

Issues: SWF-1532

spring-binding/src/main/java/org/springframework/binding/convert/converters/StringToBoolean.java

@@ -50,13 +50,13 @@ public class StringToBoolean extends StringToObject {
 
 	protected Object toObject(String string, Class<?> targetClass) throws Exception {
 		if (trueString != null && string.equals(trueString)) {
-			return Boolean.TRUE;
+			return true;
 		} else if (falseString != null && string.equals(falseString)) {
-			return Boolean.FALSE;
+			return false;
 		} else if (trueString == null && string.equals(VALUE_TRUE)) {
-			return Boolean.TRUE;
+			return true;
 		} else if (falseString == null && string.equals(VALUE_FALSE)) {
-			return Boolean.FALSE;
+			return false;
 		} else {
 			throw new IllegalArgumentException("Invalid boolean value [" + string + "]");
 		}