Make Volley an optional dependency
diff --git a/.gitignore b/.gitignore
index eee00ad..07f3f11 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,6 +20,8 @@
 samples/flickr/bin
 samples/flickr/local.properties
 samples/flickr/target
+integration/volley/target/**
+**/local.properties
 *.keystore
 **/.idea/*
 .settings