Update description.
Add GitHub link.
Various changes.

- Use native Orientation detection.
- Fixed button upside down in Portrait mode.
- Fixed compability with UIImagePickerController. (Tweak like Kamera)
- Unlocked maximum button scale to 3.0
- Remove supported for iPod touch 5G.
- Some code improvement.
Remove supported for iPod touch 5G.
No need now.
Images for Retina-3.5 iDevices.