Reset some changes to sample to be in line with how most of our nodes

actually are.

nodes/99-sample.js.demo

@@ -31,6 +31,8 @@ module.exports = function(RED) {
 
         // Store local copies of the node configuration (as defined in the .html)
         this.topic = n.topic;
+
+        // copy "this" object in case we need it in context of callbacks of other functions.
         var node = this;
 
         // Do whatever you need to do in here - declare callbacks etc
@@ -43,16 +45,16 @@ module.exports = function(RED) {
 
         // send out the message to the rest of the workspace.
         // ... this message will get sent at startup so you may not see it in a debug node.
-        node.send(msg);
+        this.send(msg);
 
         // respond to inputs....
-        node.on('input', function (msg) {
+        this.on('input', function (msg) {
             node.warn("I saw a payload: "+msg.payload);
             // in this example just send it straight on... should process it here really
             node.send(msg);
         });
 
-        node.on("close", function() {
+        this.on("close", function() {
             // Called when the node is shutdown - eg on redeploy.
             // Allows ports to be closed, connections dropped etc.
             // eg: node.client.disconnect();