html5 output is not html5?

[doits]

I am using Config::$format = 'html5';, but still get things like:

 <input <?php atts(array('required' => 'required')); ?>></input>

for

%input{:required => true}

It should instead output

<input <?php atts(array('required' => true)); ?>>,

and the atts helper should be changed to:

if($value === true)
{
    $str .= " $name";
}

The atts-helper could also depend on Config::$format, but I think it should function for itself.

[doits]

superseded by #25