Feature request - Custom attributes

[mike-allaway]

Please add the ability to specify custom HTML attributes for the select list element.

I'm sure there are many scenarios where custom attributes would be useful. For me, I need this feature to satisfy WCAG accessibility requirements for websites, as certain attributes are needed, e.g. title, aria-label, etc.

[JJJ]

As this repo is currently marked as deprecated & unmaintained, I'd like to politely and respectfully invite you to try out my accessible fork of Chosen: https://github.com/JJJ/chosen.

It merges #2596 and #2574, and could be expanded more in the future to accept any attributes.