Added several more HTML5 samples

.gitignore

Index: .gitignore
diff --git a/.gitignore b/.gitignore
index e11910e8a028f5ee5cd355b4e9996f8876273c1b..1cdf3cf3935ded7d29413170b995aaacfb76b488 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,6 +20,18 @@ packages/
 !src/site/docs/tutorials/add-elements/examples/todo/packages/
 !src/site/docs/tutorials/add-elements/examples/anagram/packages/
 !src/site/docs/tutorials/remove-elements/examples/todo_with_delete/packages/
+
+!src/site/samples/appcache/example/packages/
+!src/site/samples/dnd/example/packages/
+!src/site/samples/dndfiles/example/packages/
+!src/site/samples/filesystem/example/packages/
+!src/site/samples/imagefilters/example/packages/
+!src/site/samples/indexeddb_todo/example/packages/
+!src/site/samples/notifications/example/packages/
+!src/site/samples/raf/example/packages/
 !src/site/samples/solar/example/packages/
 !src/site/samples/solar3d/example/web/packages/
-!src/site/samples/raf/example/packages/
+!src/site/samples/terminal/example/packages/
+!src/site/samples/video/example/packages/
+!src/site/samples/webaudio/example/packages/
+!src/site/samples/websockets/example/packages/