title: simple_form, manually place the field and the error label
body: <p>In a simple_form (with bootstrap integration), i have a checkbox with a short text.
  The text is 'I've red'. <br/>
  In the case the user doesn't check the checkbox, the validation error is: <br/>
  'You have to confirm that you've read'. <br/>
  As you can see the look isn't very good, since i would like at least the checkbox to be alligned with the 'I've read' label and not with the error message. </p>
  
  <p><img src="https://i.stack.imgur.com/tY2TW.png" alt="enter image description here"></p>
  
  <p>This is the code: </p>
  
  <pre><code>&lt;%= f.input :number_of_items, :label =&gt; "I've read" %&gt;
  </code></pre>
  
  <p>So i tried the inline label, that is:</p>
  
  <pre><code>&lt;%= f.input :number_of_items, :label =&gt; false, :inline_label =&gt; "I've read" %&gt;
  </code></pre>
  
  <p>but now the result is as follows. </p>
  
  <p><img src="https://i.stack.imgur.com/a5Ymn.png" alt="enter image description here"></p>
  
  <p>That is: the checkbox is inline with the text, and this is correct... but as you can see the error is rendered at the turn of the lines!!!</p>
  
  <p>I'm looking for a solution to this specific issue.<br/></p>
  
  <p>Then I'm looking for a further customization possibility that is  a way to render independently a control and its error message.<br/>
  This would help me achieve a better, ad-hoc rendering where none of the defaults fits well.  </p>