How to combine two jQuery results
<p>How do you combine two jQuery search results? eg:</p>

<pre><code>var $allFoos = $('.foo'),
    $allBars = $('.bar')
    $allFoosAndBars = $allFoos + $allBars
;
</code></pre>

<p>Obviously, I just made up that last line, but I hope it makes it sorta clear what I mean. To be clear, the example is greatly simplified, and it could be any arbitrary sets i'm talking about, so <code>$('.foo, .bar')</code> is <em>not</em> what I'm after.</p>
