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Merge branch 'master' of https://github.com/tanomsak/Alamofire

* 'master' of https://github.com/tanomsak/Alamofire:
  add ajax_request which include X-Requested-With = XMLHttpRequest in header
  specific "Accept" application/json when use .JSON encoding
  fixed problem regarding to key escaping when .POST
  specific "Accept" application/json when use .JSON encoding and there's no parameters