Support iPhone

This pull request implements following:

* Make xcode project universal
* Support only portrait orientation for iPhone now. Support for landscape will be available in the future. On iPad all orientations are supported.

Here is how it looks on iPhone 5:

![2013-11-13 15 45 55](https://f.cloud.github.com/assets/115379/1535518/2f3f0d76-4ca5-11e3-9066-9c96c5b7ed7e.png)