Updated the logo

Also changed the cols from sm to lg it was overlapping in iPad for
vertical view

Before

![responsive site view - google chrome](https://cloud.githubusercontent.com/assets/6366212/3873008/ffb79b10-2127-11e4-848b-3270c118d9d0.jpg)
![responsive site view - google chrome_2](https://cloud.githubusercontent.com/assets/6366212/3873009/ffda69d8-2127-11e4-91e1-6d9ced181051.jpg)

After

![image](https://cloud.githubusercontent.com/assets/6366212/3873018/32b3ad10-2128-11e4-93f1-15d5a2ed3ac5.png)

![image](https://cloud.githubusercontent.com/assets/6366212/3873019/42fec0ce-2128-11e4-971b-e8999539f81d.png)