docs: function ensurePathsExist(pathsList, cb) {
  	async.eachLimit(pathsList, 10, function (pathItem, callback) {
  		var absolutePath = path.resolve(pathItem);
  		fs.stat(absolutePath, function (error, stats) {
  			if (error) {
  				return callback(new Error('Path does not exist: ' + absolutePath));
  			}
  
  			if (!stats.isDirectory()) {
  				return callback(new Error('Path is not a directory: ' + absolutePath));
  			}
  
  			return callback();
  		});
  	}, cb);
  }