Add another Solarized Light & Dark theme.

I made another Solarized Light & Dark theme for Xcode. Tested on Xcode 5/6/6.1.
![screenshot_dark](https://cloud.githubusercontent.com/assets/5107241/4832805/415900b2-5f9f-11e4-89e8-62ba459dcbdd.png)
![screenshot_light](https://cloud.githubusercontent.com/assets/5107241/4832806/41dde57a-5f9f-11e4-83ae-e64cb7e406df.png)