title: Laravel validate unique if id is the same
body: <p>I have a table/model that contains multiple albums per user.
  Is there a way to say that the column <code>title</code> should be unique, but only for the rows that have the same <code>user_id</code>? </p>
  
  <p>Example: <a href="http://pastebin.com/8dvM4a1T" rel="noreferrer">http://pastebin.com/8dvM4a1T</a></p>
  
  <p>As you can see in the example, the user with the id of 2 has created 2 albums, with the same title. I don't want that to be allowed, that's why I'm wondering if there's a way to deny that with the validator from Laravel?</p>
  
  <p>I tried this, but that did not work.</p>
  
  <pre><code>// Validator
      $validator = Validator::make($input, [
          'title' =&gt; 'required|min:1|max:255|unique:galleries,title,'. Auth::user() -&gt; id .',user_id',
          'description' =&gt; 'min:1|max:255'
      ]);
  </code></pre>
  
  <p>Any help appreciated, thanks.</p>