code: function isDir(abspath, found) {
      var stat       = fs.statSync(abspath),
          abspathAry = abspath.split('/'),
          data,
          file_name;
  
      if (!found) {
          found = {dirs: [], files: [] }
      }
  
      if (stat.isDirectory() && !isHidden(abspathAry[abspathAry.length - 1])) {
          found.dirs.push(abspath);
  
          /* If we found a directory, recurse! */
          data        = exports.readDirSync(abspath);
          found.dirs  = found.dirs.concat(data.dirs);
          found.files = found.files.concat(data.files);
  
      } else {
  
          abspathAry = abspath.split('/');
          file_name  = abspathAry[abspathAry.length - 1];
  
          if (!isHidden(file_name)) {
              found.files.push(abspath);
          }
      }
      return found;
  }
docs: Identifies if the path is directory
  
  @param  {String}  abspath   Absolute path, should be already have replaced '\' with '/' to support Windows
  @param  {Object}  found     Object: {dirs: [], files: [] }, contains information about directory's files and subdirectories
  @return {Object}            Updated 'found' object