Add complete main menu navigation, including home page, curated features...

..., browse and about pages

Fixes #108 
Fixes #35

![screen shot 2014-02-05 at 16 31 12](https://f.cloud.github.com/assets/111218/2094169/30fef032-8ec6-11e3-89ac-de2d1e2598c6.png)
![screen shot 2014-02-05 at 16 30 52](https://f.cloud.github.com/assets/111218/2094170/310e17ec-8ec6-11e3-9ff9-2cbb1a81cc3c.png)
![screen shot 2014-02-05 at 16 31 33](https://f.cloud.github.com/assets/111218/2094171/310e4eb0-8ec6-11e3-929f-34c641b87a13.png)
![screen shot 2014-02-05 at 16 30 41](https://f.cloud.github.com/assets/111218/2094172/311dade2-8ec6-11e3-8380-9e70d1241d63.png)