Extend jQuery plugin/widget object to add method
<p>I often see developers add methods to their own jquery Widget by extending the widget object. I'm not certain I really understand why and would appreciate if somebody could explain.</p>

<p>For example, the author(s) of <a href="https://github.com/jquery/jquery-ui/blob/master/ui/jquery.ui.autocomplete.js#L551" rel="nofollow">jQuery UI Autocomplete Widget</a> add 2 methods to their widget, why didn't they just have it in the original widget object?</p>
