fix handler.call(plugin) bug

lib/server.js

@@ -5,7 +5,7 @@ var yaps_plugin = require("./plugin.js");
 
 var handler_chain = function(handlers, request, server, response, not_found){
     if(handlers.length){
-        var plugin = server.enabledPlugins[0][1];
+        var plugin = server.enabledPlugins[handlers[0][1]];
         handlers[0][0].call(plugin, request, server, function(status, body){
             if(status === null || status === undefined){
                 handler_chain(handlers.slice(1), request, server, response, not_found);