Fix foundation compatibility issues

I've found some styling issues when working with foundation. Following a screenshot.
What i did:
* Fixed .nw-toolbar label and input[type=checkbox]
* Added button to .nw-button (Buttons were showing blue on hover)
![schermata 10-2456951 alle 11 50 44](https://cloud.githubusercontent.com/assets/1750404/4699399/4f96691e-5840-11e4-96d5-78c90d9564a3.jpg)