Apache Rat additional excludes rules added (#3631)

* adding website2 folder and travis toolchain bazel rule to .rat_excludes

* adding missed directory for generated site docs

Author: joshfischer1108

.rat-excludes

@@ -18,8 +18,13 @@ heron\.iml
 bazel-.*
 m4
 META-INF
-# website and website2 are not part of the release
+# website, website2, and generated-ste are not part of the release
 website
+website2
+generated-site
+
+# travis toolchain config is not part of the release
+cc_toolchain_config.bzl
 
 # UI resources
 # Apache 2.0 licenses & MIT Licenses