Added app, tests, lint to BUCK file for web/gui2

Change-Id: I94912cb18f31db26971b66c9d851fb57f022df54
diff --git a/web/gui2/.gitignore b/web/gui2/.gitignore
index b349eff..f18ba06 100644
--- a/web/gui2/.gitignore
+++ b/web/gui2/.gitignore
@@ -1,3 +1,4 @@
 node_modules/
 documentation/
 dist/
+coverage/