Add orange color to Apple Swift language

The self-explanatory title is self-explanatory.

How would it look like beside Objective-C (I cropped those bars a little bit):

![zrzut ekranu 2014-06-03 o 16 01 22](https://cloud.githubusercontent.com/assets/565231/3161314/932b393a-eb2a-11e3-941c-9be01bb4d4f4.png)
![zrzut ekranu 2014-06-03 o 16 01 13](https://cloud.githubusercontent.com/assets/565231/3161319/97f0e32a-eb2a-11e3-8f09-2a2aad662a80.png)

Why orange? Because [it's the color of Swift](https://developer.apple.com/swift/)! :smiley: