Add autocomplete argument to beforeUseConverter

[cjmendoza]

I am using beforeUseConverter to include some extra parameters based on current values in the form. In the callback, in order to modify the url or the extraParams I need to have a handle to the object. I modified version locally by adding param to the call. Can you include in future releases.

/**
 * Convert string before use
 * @param {String} s
 */
$j.Autocompleter.prototype.beforeUseConverter = function(s) {
    s = this.getValue(s);
    var converter = this.options.beforeUseConverter;
    if ($j.isFunction(converter)) {
        s = converter(s, this);  ***made change here.
    }
    return s;
};

Thanks