Feature/global mobile friendly navbar

Update the main navigation bar.

* Put the navbar on all pages
* Comment out the "Orders" link
* Add links to [Enter Event Code, View Points, View Upcoming Events]
* Make the navigation bar responsive using Bootstrap built-ins

### Screenshots
Desktop:
![screen shot 2014-05-31 at 4 12 17 pm](https://cloud.githubusercontent.com/assets/342964/3140023/e6c8e01a-e8ff-11e3-9344-afc5150459aa.png)

Mobile:
![screen shot 2014-05-31 at 4 04 44 pm](https://cloud.githubusercontent.com/assets/342964/3140020/d3351e56-e8ff-11e3-8cb0-486d4d0aada7.png)

Mobile expanded:
![screen shot 2014-05-31 at 4 04 53 pm](https://cloud.githubusercontent.com/assets/342964/3140021/d33565a0-e8ff-11e3-864c-226309f09649.png)