title: Difficulties using Geb to enable a disabled control using .removeAttr()
body: <p>Firstly, I am a Geb newbie and also fairly new to web technology in general, that said my issue is ... I am trying to enable the following input element:</p>
  
  <p><code>&lt;input class="span6 offset2" id="uploadFile" value="" placeholder="Select File" disabled="disabled" /&gt;</code></p>
  
  <p>Within geb I have the following:</p>
  
  <p><strong>uploadFileField.removeAttr(disabled)</strong> ... where <em>uploadFileField equates to { $('input', id:"uploadFile") }</em></p>
  
  <p>but I am getting the following error:</p>
  
  <p><em>java.lang.UnsupportedOperationException: Value of 'disabled' attribute can only be checked for the following elements: button, input, option, select, textarea.</em></p>
  
  <p><strong>Question</strong> - Do you think the message is telling me that the ‘disabled’ attribute can only be checked? – i.e cannot be removed?, otherwise - what am I doing wrong? any suggestions will be deeply appreciated.</p>