Add hasMoreMessages to discord.js

src/tracker/discord.js

@@ -69,6 +69,13 @@ var DISCORD = (function(){
       return obj.channel.length === 0 ? null : obj;
     },
     
+    /*
+     * Returns true if there are more messages available.
+     */
+    hasMoreMessages: function(){
+      return DOM.cls("messages")[0].children[0].classList.contains("has-more");
+    },
+    
     /*
      * Forces the message column to scroll all the way up to load older messages.
      */