title: Assign this to self in jQuery UI
body: <p>I am currently writing a jQuery UI plugin and investigate therefore the existent jQuery UI sources.
  In the <code>_create</code> method of the accordion plugin <code>this</code> is assigned to <code>self</code> <a href="https://github.com/jquery/jquery-ui/blob/master/ui/jquery.ui.accordion.js#L37" rel="nofollow">(link to source)</a>, but then both <code>this</code> and <code>self</code> are used side by side in that method. So why do they chose to assign to <code>self</code> at all?</p>