Additionnal features (autocomplete timeout) and (filter already in values)

[kiorky]

you may be interrested by https://github.com/mobyle2/mobyle2.core/blob/master/src/mobyle2/core/static/js/ajax-chosen.js.

I do not have the time now to do a pull request.
Just for information, it filters already in values and also have better code to check that the user has finished its words (stolen from autocomplete plugin)