message: Grid line size accepts decimal pt values.
diff: @@ -934,7 +934,7 @@ var PptxGenJS = function(){
  var tagName = 'c:'+ type + 'Gridlines';
  strXml = '<'+ tagName + '>';
  strXml += ' <c:spPr>';
  - strXml += ' <a:ln w="' + (glOpts.size || defaults.size) * ONEPT +'" cap="flat">';
  + strXml += ' <a:ln w="' + Math.round((glOpts.size || defaults.size) * ONEPT) +'" cap="flat">';
  strXml += ' <a:solidFill><a:srgbClr val="' + (glOpts.color || defaults.color) + '"/></a:solidFill>'; // should accept scheme colors as implemented in PR 135
  strXml += ' <a:prstDash val="' + (glOpts.style || defaults.style) + '"/><a:round/>';
  strXml += ' </a:ln>';
  