Directory structure updates (#6)

Author: bvennam

runtimes/nodejs-8/actions/helloworld.js

@@ -12,3 +12,4 @@ packages:
     actions:
       helloworld:
         function: actions/helloworld.js
+        runtime: nodejs:8

runtimes/nodejs-8/manifest.yaml

@@ -12,3 +12,4 @@ packages:
     actions:
       helloworld:
         function: actions/helloworld.php
+        runtime: php:7.1

runtimes/nodejs/manifest.yaml

@@ -12,3 +12,4 @@ packages:
     actions:
       helloworld:
         function: actions/helloworld.py
+        runtime: python-jessie:3