Include output messages for graph protocol in docs now that we are not repeating every message

Author: ifitzpatrick

Gruntfile.coffee

@@ -147,7 +147,7 @@ module.exports = ->
     desc = {}
     protocols =
       runtime: ['input', 'output']
-      graph: ['input']
+      graph: ['input', 'output']
       component: ['input', 'output']
       network: ['input', 'output']