Merge pull request oauthjs#101 from thomasdashney/master

changed error handler res.send to fix express deprecation warnings

lib/oauth2server.js

@@ -127,7 +127,7 @@ OAuth2Server.prototype.errorHandler = function () {
     if (err.headers) res.set(err.headers);
     delete err.headers;
 
-    res.send(err.code, err);
+    res.status(err.code).send(err);
   };
 };