In @component use void.class to mark default

The Component class itself was used to mark the default value (as null
is not allowed). "void.class" seems to be a little bit more correct, as
it means that it does, the default is nothing.

restx-factory/src/main/java/restx/factory/Component.java

@@ -10,7 +10,7 @@
 
     /**
      * @return the class to use for the name of this component,
-     * if not defined the annotated class will be used
+     * if not defined, the annotated class will be used
      */
-    Class<?> asClass() default Component.class; // trick to mark default value, as null is not permitted
+    Class<?> asClass() default void.class; // trick to mark default value, as null is not permitted
 }

restx-factory/src/main/java/restx/factory/processor/FactoryAnnotationProcessor.java

@@ -247,7 +247,7 @@ private void processComponents(RoundEnvironment roundEnv) throws IOException {
                 } catch (MirroredTypeException mte) {
                     asClass = asTypeElement(mte.getTypeMirror());
                 }
-                if (asClass.getQualifiedName().toString().equals(Component.class.getName())) {
+                if (asClass == null) {
                     // no class as been forced, so use the annotated class
                     asClass = component;
                 }