Dynamic donations

@gholtslander 

One really important note, you have to insert a row into your miniblog-config table for this to work!

![image](https://cloud.githubusercontent.com/assets/463132/2624041/81f5674a-bd1b-11e3-8ac9-4893d99cbc17.png)

The last one is the one you need to have, `donations-to-date`.