title: Share Extension to open containing app
body: <p>I want to create an Android Style share feature for my app. 
  I created a share extension which gets called when you select pictures inside the stock photo app and press share.
  Now I want those pictures to be sent to the main app and get handled over there.
  My question is now:</p>
  
  <ol>
  <li>Can iOS open my app after a button is pressed on the share extension window?</li>
  <li>How do I get the picture files inside my main app?</li>
  </ol>