add minimal-ui meta & layout update

`meta minimal-ui` related article below : 
[https://developer.apple.com/library/ios/releasenotes/General/RN-iOSSDK-7.1/#//apple_ref/doc/uid/TP40013935-CH1-SW7](https://developer.apple.com/library/ios/releasenotes/General/RN-iOSSDK-7.1/#//apple_ref/doc/uid/TP40013935-CH1-SW7)