GUI -- Added UiViewHidden subclass of UiView to allow for views that do not have an entry in the navigation panel.
- Added placeholder "flow" view.

Change-Id: I3a969d16baf608b132c10cfc7f154d0ce51c765e
diff --git a/web/gui/src/main/webapp/app/view/flow/flow.css b/web/gui/src/main/webapp/app/view/flow/flow.css
new file mode 100644
index 0000000..7166e57
--- /dev/null
+++ b/web/gui/src/main/webapp/app/view/flow/flow.css
@@ -0,0 +1,22 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ ONOS GUI -- Flow View -- CSS file
+ */
+
+#ov-flow td {
+}
\ No newline at end of file