changes in order to satisfy jshint

[L120:C18] Wrap the /regexp/ literal in parens to disambiguate the slash operator.
          return /^application\/json/.test(xhr.contentType());
[L307:C27] Expected '===' and instead saw '=='.
      if (requests.length == 0) return [];
[L307:C33] Expected '{' and instead saw 'return'.
      if (requests.length == 0) return [];
[L318:C31] Expected '===' and instead saw '=='.
          if (requests[i].url == url_to_match) {
added platform x64-mingw32
added support for multiple headers with same name