do some 'proper' 'inheritance' for plugins

lib/server.js

@@ -71,8 +71,14 @@ server.prototype.errorHandler = function(error){
 };
 
 server.prototype.registerPlugin = function(plugin_constructor){
-    util.inherits(plugin_constructor, yaps_plugin);
-    var plugin = new plugin_constructor(this.settings);
+    var new_plugin = function(options){
+        yaps_plugin.call(this, options);
+        plugin_constructor.call(this, options);
+    };
+    // dont judge me!
+    util._extend(new_plugin.prototype, yaps_plugin.prototype);
+    util._extend(new_plugin.prototype, plugin_constructor.prototype);
+    var plugin = new new_plugin(this.settings);
     this.enabledPlugins.push(plugin);
     for(var method in plugin.routes){
         this.routes[method] = this.routes[method] || {};