title: Ionic 2 LoadingController include custom content
body: <p>I want to use custom components inside the content option of the LoadingController of my Ionic 2 project but when the loading comes up the browser console shows me the message:</p>
  
  <pre><code>WARNING: sanitizing HTML stripped some content (see http://g.co/ng/security#xss).
  </code></pre>
  
  <p>And the component is not showing, making test i realise that using any other TAG that was not standard HTML TAG throws this error, how i can use angular 2 security for bypass the error? what i whant is:</p>
  
  <pre><code>    this.loadingController.create({
          spinner: 'hide',
          content: `
          &lt;div&gt;
              &lt;some-component&gt;&lt;/some-component&gt;
              &lt;h3&gt;a message...&lt;/h3&gt;
          &lt;/div&gt;`
      })
  </code></pre>