Sync outline font size with editor

@devoncarew 

Also set the increment/decrement step for the font size to 1. 2 was too coarse, especially on Linux, where Monaco is unavailable and replaced by something else (but even on other OSes 1 gives finer control, obviously).

![screen shot 2014-08-26 at 1 39 34 pm](https://cloud.githubusercontent.com/assets/5606182/4052905/55a423fe-2d71-11e4-9bcc-09099e7f43bd.png)

`is` :)