added conversion service performance optimizations; added mapping cyclical ref handling; removed ConverterInfo in favor of specifying S and T at registration time if necessary

org.springframework.context/src/test/resources/log4j.xml

@@ -11,11 +11,7 @@
 		</layout>
 	</appender>
 
-	<logger name="org.springframework.beans">
-		<level value="warn" />
-	</logger>
-
-	<logger name="org.springframework.binding">
+	<logger name="org.springframework.mapping">
 		<level value="debug" />
 	</logger>