Added Icons to differentiate between shell and text commands

![screen shot 2014-03-21 at 11 53 17 am](https://f.cloud.github.com/assets/461578/2481687/e2956c6a-b0de-11e3-94b9-51d86509b790.png)
![screen shot 2014-03-21 at 11 54 14 am](https://f.cloud.github.com/assets/461578/2481688/e3081a44-b0de-11e3-89c4-a122b7f8e8e7.png)
![screen shot 2014-03-21 at 11 54 23 am](https://f.cloud.github.com/assets/461578/2481689/e3241276-b0de-11e3-9104-83e5da8a4ad3.png)
![screen shot 2014-03-21 at 11 53 23 am](https://f.cloud.github.com/assets/461578/2481691/e64f4574-b0de-11e3-86ee-1afbee503496.png)