Cancel intent response

Added response for the cancel intent and removed the duplicate cancel
intent functions.

lib/handlers.js

@@ -7,6 +7,7 @@ var WELCOME_DESCRIPTION = 'This skill allows you to manage your Couch Potato mov
 var HELP_RESPONSE = ['You can ask Couch Potato about the movies in your queue or add new movies',
     'to it. Try asking "is The Godfather on the list?". If it\'s not and you want to add it, try',
     'saying "add The Godfather".'].join(' ');
+var CANCEL_RESPONSE = 'Exiting Couch Potato';
 
 var config = require('dotenv').config();
 var cp = new CouchPotato({
@@ -124,11 +125,7 @@ function handleNoIntent(req, resp) {
 }
 
 function handleCancelIntent(req, resp) {
-  resp.shouldEndSession(true).send();
-}
-
-function handleCancelIntent(req, resp) {
-  resp.say(HELP_RESPONSE).send();
+  resp.say(CANCEL_RESPONSE).shouldEndSession(true).send();
 }
 
 module.exports = {