title: ionic serve starts on localhost and not the server IP
body: <p>When running ionic serve I see this:</p>
  
  <pre><code>  Gulp startup tasks: [ 'sass', 'watch' ]
    Running dev server: http://localhost:8100
    Running live reload server: http://localhost:35729
    Watching : [ 'www/**/*', '!www/lib/**/*' ]
    Ionic server commands, enter:
      restart or r to restart the client app from the root
      goto or g and a url to have the app navigate to the given url
      consolelogs or c to enable/disable console log output
      serverlogs or s to enable/disable server log output
      quit or q to shutdown the server and exit
  </code></pre>
  
  <p>Which means I cannot access the app from a browser as its only listening for localhost. How can I change localhost to the actual server IP?</p>
  
  <p>Thanks</p>