added a demo without using storyboard

![Demo on how to make the show the image in full screen](https://cloud.githubusercontent.com/assets/797182/4075826/6e5b2016-2eb4-11e4-9a2a-7180382a17f5.gif)

This demo using neither Nib nor storyboard, but code the UI programmatically. Besides, I also demo on _how to show the image in full screen_.