added info about direct SLF4J use

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-3/trunk@1412765 13f79535-47bb-0310-9956-ffa450edef68

maven-embedder/src/site/apt/logging.apt

@@ -37,3 +37,16 @@ public class DefaultMyComponent
     private Logger logger;
 }
 +------
+
+ Starting with Maven 3.1.0, SLF4J Logger can be used directly too, without Plexus. Of course, this will only work when run under
+ Maven 3.1.0, then this technique can be used safely only in Maven core components.
+ 
++-----
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class Wombat
+{
+   final Logger logger = LoggerFactory.getLogger(Wombat.class);
+}
++-----

pom.xml

@@ -564,4 +564,13 @@
       </build>
     </profile>
   </profiles>
+
+  <repositories>
+    <repository>
+      <id>wagon-2.3-stage</id>
+      <name>wagon-2.3-stage</name>
+      <url>https://repository.apache.org/content/repositories/maven-055/</url>
+    </repository>
+  </repositories>
+
 </project>