title: Add default value to select list in Laravel form::select
body: <p>Simple question, I hope.  </p>
  
  <p>I need to add a default value to my select list 'Please Select', and set it to disabled.</p>
  
  <pre><code>&lt;select name="myselect" id="myselect"&gt;
    &lt;option value="" disabled&gt;Please Select&lt;/option&gt;
    &lt;option value="1"&gt;Item 1&lt;/option&gt;
    &lt;option value="2"&gt;Item 2&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>My current laravel form::select is </p>
  
  <pre><code>{{
  Form::select(
      'myselect',
      $categories,
      $myselectedcategories,
      array(
          'class' =&gt; 'form-control',
          'id' =&gt; 'myselect'
      )
  }}
  </code></pre>
  
  <p>How can I amend this to include the default option value? </p>