title: Validate custom form field in laravel auth
body: <p>I am using laravel 5.1.9 LTS. I am using the out of the box laravel`s auth features. I added a new form field in registration and it is not being validated.
  The new form field that I added.</p>
  
  <pre><code> &lt;div class="controls"&gt;
                                  &lt;div class="controls first"&gt;
                                      &lt;select name="account_type" class="form-control"&gt;
                                          &lt;option value="0" &gt;Select the account type&lt;/option&gt;
                                          &lt;option value="1"&gt;Buyer&lt;/option&gt;
                                          &lt;option value="2"&gt;Seller&lt;/option&gt;
                                          &lt;option value="3"&gt;Agent&lt;/option&gt;
                                      &lt;/select&gt;
                                  &lt;/div&gt;
                                  &lt;p class="help-block"&gt;
                                      {{ $errors-&gt;first('account_type') }}
                                  &lt;/p&gt;
                              &lt;/div&gt;
  </code></pre>
  
  <p>The validation part</p>
  
  <pre><code>protected function validator(array $data)
  {
      return Validator::make($data, [
          'email' =&gt; 'required|email|max:255|unique:users',
          'account_type' =&gt; 'required|min:1',
          'password' =&gt; 'required|confirmed|min:6',
      ]);
  }
  </code></pre>
  
  <p>I have also put account_type in the fillable protected variable but still it is not working</p>