lou/multi-select — pull request #92 by Frique (2013-08-19 06:28:49+00:00)
Title: Adds option to limit the selection, and 2 related callback functions

Option "selectionLimit" with 0 for unlimited or (int) for a limit.
options.limitReached() is called when reaching the limit,
options.limitBlocked() is called when trying to add more than the
limit. Also works for adding entire group and select_all, but
select_all has a new param to respect or ignore the limit.