Add some note messages in ExtensionAnnotationProcessor

pf4j/src/main/java/ro/fortsoft/pf4j/processor/ExtensionAnnotationProcessor.java

@@ -53,6 +53,7 @@ public class ExtensionAnnotationProcessor extends AbstractProcessor {
     public synchronized void init(ProcessingEnvironment processingEnv) {
         super.init(processingEnv);
 
+        note("{}.init()", ExtensionAnnotationProcessor.class);
         storage = createStorage();
     }
 
@@ -83,6 +84,7 @@ public class ExtensionAnnotationProcessor extends AbstractProcessor {
             return false;
         }
 
+        note("Processing @{}", Extension.class);
 		for (Element element : roundEnv.getElementsAnnotatedWith(Extension.class)) {
             // check if @Extension is put on class and not on method or constructor
             if (!(element instanceof TypeElement)) {