Add Chrome Devtools Theme

Google Chrome DevTools based on ZeroDarkMatrix Theme for Chrome by Maurice Cruz: https://github.com/mauricecruz/chrome-devtools-zerodarkmatrix-theme

![screen shot 2013-10-30 at 16 12 33](https://f.cloud.github.com/assets/1696024/1439719/de957610-418e-11e3-9931-d6f5baa2ed36.png)