Enable routing via /functions/ endpoint

sample-functions/WebhookStash/README.md

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+WebhookStash
+============
+
+Example serverless function shows how to stash way contents of webhooks called via API gateway.
+
+Each file is saved with the UNIX timestamp in nano seconds plus an extension of .txt
+
+Example:
+
+```
+# curl -X POST -v -d @$HOME/.ssh/id_rsa.pub localhost:8080/function/webhookstash
+```
+
+Then if you find the replica you can check the disk:
+
+```
+# docker exec webhookstash.1.z054csrh70tgk9s5k4bb8uefq find
+```