title: MapView to show all annotations and zoom in as much as possible of the map
body: <p>I basically have a map where I add two annotations and they are shown as expected. </p>
  
  <p>Then I´m using the following code:</p>
  
  <pre><code>let annotations = [start, end]
  mapView?.showAnnotations(annotations, animated: false)
  </code></pre>
  
  <p>And this zooms to show my map with the two annotations, but the map could be zoomed in much more and show a more detailed map view.</p>
  
  <p><a href="http://i.stack.imgur.com/IOpbv.png" rel="noreferrer">This is what I get today</a> and <a href="http://i.stack.imgur.com/xRERV.png" rel="noreferrer">this is the expected result</a> that I want.</p>
  
  <p>As you can see the map could be zoomed in a lot more.</p>
  
  <p>Any ideas how to achieve this?</p>