Add "chosen:close" triggerable event
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Merge pull request #1663 from harvesthq/chosen_close_event

"chosen:close" triggerable event
Added 'Add item link'
Updated use of Add options
Guard against adding already selected options
Ported 'Add Item' link to chosen.proto
Performance fix for deciding when to show the "Add this item" link
Ported performance fix to prototype
Regenerate js files for performance fix
Updated callback parameter to object with `value` and `text` property
Show add item link even for prefix matches
Prototype merge
Fixed adding options
Add <option /> with selected attribute

Add <option /> with selected attribute instead of selecting it
afterwards with JS
Updated the way for adding items using a custom callback
removed debug console.log
Updated examples
Fixes issues with adding options in prototype version
Added option for adding values by keyboard
persistent_create_option was not implemented in prototype version
removed console.log