minimize iOS Safari UI on iOS 7.1 beta 2

In iOS 7.1 beta 2 was added another `viewport` meta tag option: `minimal-ui`. Which slightly minimize Safari UI, thus it can create native app like feel.

You can observe diff:

*Without `minimal-ui` to the left and with `minimal-ui` to the right.*

<a href="http://i.imgur.com/uKrRfoN.png" target="blank_"><img src="http://i.imgur.com/uKrRfoN.png" width="200"></a> <a href="http://i.imgur.com/NRAHuBQ.png" target="blank_"><img src="http://i.imgur.com/NRAHuBQ.png" width="200"></a>