[development] behaviors context

[Earl Miles]

Matt wrote:
> Thus my original claim: You are at the mercy of whatever calls
> Drupal.attachBehaviors(). Unless you are absolutely positive you can
> account for all use cases (and thus all callings of Drupal.attach()),
> you're better off ignoring context.

I totally disagree. It's either a jquery object or something you can 
easily make into a jquery object. Using $(context) should always work 
and you can get a DOM element using $(context).get(0). Ignoring context 
will lead to poor performance.