code: function copy(from, to){
    to = to || from;
    from = path.join(tpl, from);
    fs.createReadStream(from).pipe(fs.createWriteStream(to));
  }
docs: [copy description]
  @param  {[type]} from [description]
  @param  {[type]} to   [description]
  @return {[type]}      [description]