Force resize-mini-windows

Hi!

I set `resize-mini-windows` to `nil` in my config file. And `org-trello/install-board-and-lists-ids` didn't work correctly.

![old](https://cloud.githubusercontent.com/assets/1789390/2565463/252b6524-b8b5-11e3-8472-dd4b619ed1e0.png)

Now it works fine.

![new](https://cloud.githubusercontent.com/assets/1789390/2565486/4b9e7386-b8b5-11e3-87a8-fcb3f7957c82.png)