Reduce size of navbar

#169 

![image](https://cloud.githubusercontent.com/assets/1275831/5448762/8e1787ca-84ac-11e4-85ec-796e58820852.png)

![image](https://cloud.githubusercontent.com/assets/1275831/5448770/afe8d494-84ac-11e4-894d-ddf8bae8b7da.png)

![image](https://cloud.githubusercontent.com/assets/1275831/5448776/c4312aaa-84ac-11e4-8d84-f1c517dc636c.png)

![image](https://cloud.githubusercontent.com/assets/1275831/5448777/cd155f06-84ac-11e4-9e1e-11a9fd358ad6.png)