code: function( replace ){
          var _buffer = [],
              _url,
              _code,
              _files  = replace.css ,
              _filename;
          for( var i = _files.length; i--; ){
              _url    = Path.join( config.dir.srcDir , _files[ i ] );
              if( grunt.file.exists( _url ) ){
                  _code = tool.fixImageUrl( grunt.file.read( _url ).toString() , _url );
                  _buffer.push( _code );
              };
          };
          _code = new mincss( config.mincss ).minify( _buffer.join( "" ) );
          _filename   = "css/" + MD5( _code ) + ".css";
          grunt.file.write( Path.join( config.dir.pubDir , _filename ) , _code );
          return _filename;
      }
docs: /*!
  压缩文件
  @replace    {object}    replace 的配置文
  @dest       {string}    保存的目标地址
  return      {string}