Move cell_width calculation from on_resize_handler to drag helper and…

… resize to prevent outerWidth() glitch introduced on window resize events.

Fix resize bugs.

Fix the bug that the dragged card will have default width if dragged …

…after resize.

add itemadd event, only_pass_info_to_dropped_gridstack option

gridstack.js with multi-column(group) drag n drop support

v0.2.1 release

Release v0.2.0

v0.1.0 description