message: Replace jquery each by standard forEach
  I don't know why but this $.each don't work in a node/react app.
  It triggers an error and prevent the file to be generated and saved
diff: @@ -4260,7 +4260,7 @@ var PptxGenJS = function(){
  strXml += '<TitlesOfParts>';
  strXml += '<vt:vector size="'+ (gObjPptx.slides.length+1) +'" baseType="lpstr">';
  strXml += '<vt:lpstr>Office Theme</vt:lpstr>';
  - $.each(gObjPptx.slides, function(idx,slideObj){ strXml += '<vt:lpstr>Slide '+ (idx+1) +'</vt:lpstr>'; });
  + gObjPptx.slides.forEach(function(slideObj, idx){ strXml += '<vt:lpstr>Slide '+ (idx+1) +'</vt:lpstr>'; });
  strXml += '</vt:vector>';
  strXml += '</TitlesOfParts>';
  strXml += '<Company>'+gObjPptx.company+'</Company>';
  