Dan frontend

* add fixed to top and responsive navbar
* add margin-top to main content so it is not hidden by navbar

if (pull request okay) {
 merge to master; 
}

![haleighluja](https://f.cloud.github.com/assets/3147345/1509330/adde1e2a-4a42-11e3-88da-66a581fcf06a.gif)