Modernized to iOS 6.1 SDK.

Refactored to ARC, NSJSONSerialization that is built into the system,
and modern API.
Further modernization.

Now it is using the latest syntax that is clang only, and all methods
are modernized. I will find it some better image resources too.
FInal change
Merge pull request #1 from myWorld-OpenDev/master

This thing is totally modernized now, consider keep maintaining it?