Added ability to use wildcard content

[ee0pdt]

You can now add wildcard content before and after, e.g.:

'extras'=>array(
      '*'=>array(
        'class' => 'form-control',
        'content_before'=>'<div class="form-group">',
        'content_after'=>'</div>',
        )
    ),

[RobinMalfait]

Thanks