Enlarge the perspective buttons on the toolbar.

Fly was way too small and Plan needed to be a tad bigger as well.

From:
![old](https://cloud.githubusercontent.com/assets/206363/5292428/b5468732-7b16-11e4-8b01-8e98a4e1b3c6.png)

To:
![new](https://cloud.githubusercontent.com/assets/206363/5292429/b66a3852-7b16-11e4-9168-e4272793cb2c.png)