Added additional icons

New icons:

* Google Chrome Canary:
![google chrome canary](https://cloud.githubusercontent.com/assets/5241697/3605610/3725e2aa-0d2d-11e4-92f3-eac66c23ecea.png)

* Xcode 6 Beta:
![xcode 6 beta](https://cloud.githubusercontent.com/assets/5241697/3605608/30f736d6-0d2d-11e4-90b3-0be4ee8d62c5.png)