Warn if editor routes are accessed but runtime not started

Closes #816

red/runtime/index.js

@@ -1,5 +1,5 @@
 /**
- * Copyright 2013, 2015 IBM Corp.
+ * Copyright 2013, 2016 IBM Corp.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,6 +28,8 @@ var os = require("os");
 
 var runtimeMetricInterval = null;
 
+var started = false;
+
 var stubbedExpressApp = {
     get: function() {},
     post: function() {},
@@ -142,6 +144,7 @@ function start() {
                     log.info(log._("runtime.paths.settings",{path:settings.settingsFile}));
                 }
                 redNodes.loadFlows().then(redNodes.startFlows);
+                started = true;
             }).otherwise(function(err) {
                 console.log(err);
             });
@@ -173,6 +176,7 @@ function stop() {
         clearInterval(runtimeMetricInterval);
         runtimeMetricInterval = null;
     }
+    started = false;
     return redNodes.stopFlows();
 }
 
@@ -190,5 +194,8 @@ var runtime = module.exports = {
     events: events,
     nodes: redNodes,
     util: require("./util"),
-    get adminApi() { return adminApi }
+    get adminApi() { return adminApi },
+    isStarted: function() {
+        return started;
+    }
 }