fix bug in API w/ serializer on v6. query maybe an empty object

nodejs/node#6289
This pull request changes the query string to be an empty object rather
than an object inherited from Object.prototype. So it no longer has
the hasOwnProperty method

lib/api.js

@@ -20,6 +20,7 @@ var Class = require( './class' ) // this is Class
  , util = require('util')
  , Boom = require('boom')
  , isObject = require('mout/lang/isObject')
+ , has = require('mout/object/hasOwn')
  , debug = require('debug')('tastypie:api')
  , Options = require( './class/options' )
  , pkg = require('../package.json')
@@ -119,7 +120,7 @@ Api = new Class( /** @lends module:NAME.Api.prototype */{
 
  debug('requested format %s', format);
 
- if( query.hasOwnProperty('callback') && !( query.hasOwnProperty('format') ) ){
+ if( has(query,'callback') && !( has(query, 'format') ) ){
  return reply.continue();
  }