Small CSS fix for the dashboard

I've added some bottom margin to the `bladeset` box as it was sticking to the bottom of the page if you had a lot of bladesets&blades.

Before:
![image](https://cloud.githubusercontent.com/assets/356488/2863016/fef131ba-d1fd-11e3-8598-be7bce48b526.png)

After:
![image](https://cloud.githubusercontent.com/assets/356488/2863017/044f25a4-d1fe-11e3-8f37-31b17dc97bc5.png)