Remove tree settings wheel icon and replace symbols

From:
![image](https://cloud.githubusercontent.com/assets/28447/5058723/98f1fbb6-6cfc-11e4-948d-06723e036f6c.png)
and
![image](https://cloud.githubusercontent.com/assets/28447/5058727/d8a222c2-6cfc-11e4-82b9-767bc9276c5e.png)


To:
![image](https://cloud.githubusercontent.com/assets/28447/5058720/7e785762-6cfc-11e4-9382-df37627a503e.png)