Fixed checkbox bug in grid.js
minor changes
Added support for 'autosave' in grid.js
Added 'data-r' option for grid.js in order to update columns instead of rows.
Adding in_group? to visitor
Added preview option to [form], using JOIN for all queries (qb 1.2.0). Added 'in_group' for visitor.
Added options to query_parse to ignore unwanted parameters. Added 'hparams' option to only return Hash parameters from params.
Fixed query_parse_dates to properly convert to UTC.
Do not display labels for hidden fields.
Fixed preview form inside block.
Added support for custom upload forms, custom img_tag attributes and other bug fixes.