Add Runner interface.

testing/resources/node_hooks_repo/bin/main.js

@@ -0,0 +1,3 @@
+#!/usr/bin/env node
+
+console.log('Hello World');

testing/resources/node_hooks_repo/manifest.yaml

@@ -0,0 +1,4 @@
+-   id: foo
+    name: Foo
+    entry: foo
+    language: node

testing/resources/node_hooks_repo/package.json

@@ -0,0 +1,5 @@
+{
+    "name": "foo",
+    "version": "0.0.1",
+    "bin": {"foo": "./bin/main.js"}
+}