Added javadocs and separated trivial implementations into distinct packages.
diff --git a/core/trivial/src/main/javadoc/org/onlab/onos/event/impl/package.html b/core/trivial/src/main/javadoc/org/onlab/onos/event/impl/package.html
index a22d62d..87f0d91 100644
--- a/core/trivial/src/main/javadoc/org/onlab/onos/event/impl/package.html
+++ b/core/trivial/src/main/javadoc/org/onlab/onos/event/impl/package.html
@@ -1,3 +1,3 @@
 <body>
-ONOS local event dispatching mechanism.
+Local event dispatching mechanism.
 </body>
\ No newline at end of file