Navigation accessibility

Changing the flow of navigation for better accessibility.

Currently when using keyboard the "current section" is above main navigation:
![flowbefore](https://cloud.githubusercontent.com/assets/2579465/4772100/2aac5dcc-5b95-11e4-8e14-bff0cc2d7339.png)

After this change the flow will be in the correct order:
![flowafter](https://cloud.githubusercontent.com/assets/2579465/4772109/3557cf04-5b95-11e4-9e3e-9138bf8fdfd3.png)

I also changed the names of the classes as the old ones didn't make sense anymore. I've used more vague names now.