Added new event. Trigger when initialized. Fixing #543.

Added the ability to add class to customize class of li.

Fixed #548. Updated refresh to improve performance with large lists.

You can now add a class option to a node of the data provider options and it will be appended to the list item.

You can now add a class option to a node of the data provider options and it will be appended to the list item.

Added option to collapse groups (some kind of sub menu)

Add a placeholder using data-placeholder attribute

Fixed "All Selected" problem on non-multiselect with one option

added delimiter option to control the delimiter character for mouse-over

faq: add example of getting values dynamically

Add a placeholder using data-placeholder attribute so we don't need to create an entire function if we want to add placeholders to multiple multiselects.