title: Post request not working on Restful API Codeigniter
body: <p>I have installed RESTful Codeigniter API on my Codeigniter project. When I test API Example and call through Chrome postman rest client by <a href="http://textilexports.com/donate/api/example/users" rel="nofollow">http://textilexports.com/donate/api/example/users</a> url, I got that error in Post response.</p>
  
  <pre><code>{
      "id": 100
      "name": null
      "email": null
      "message": "Added a resource"
  }
  </code></pre>
  
  <hr>
  
  <pre><code>public function users_post()
  {
      // $this-&gt;some_model-&gt;update_user( ... );
      $message = [
          'id' =&gt; 100, // Automatically generated by the model
          'name' =&gt; $this-&gt;input-&gt;post('name'),
          'email' =&gt; $this-&gt;input-&gt;post('email'),
          'message' =&gt; 'Added a resource'
      ];
      $this-&gt;set_response($message, REST_Controller::HTTP_CREATED);
  }
  </code></pre>