Added Chrome CIRC icon (closes #783) - Other additions to follow...

![chrome-bebigdkelppomhhjaaianniiifjbgocn-default](https://cloud.githubusercontent.com/assets/5674757/3073500/88a42a78-e2ef-11e3-9bf9-0300192c4708.png)
![jitsi](https://cloud.githubusercontent.com/assets/5674757/3075155/72cd3fdc-e367-11e3-9c4b-7aa7f39581c8.png)