Add wrap around setting

Simple, I just added the wrap around feature to the settings window and hooked it up to user defaults.
The settings looks like this now:

![screen shot 2014-10-01 at 19 27 52](https://cloud.githubusercontent.com/assets/57446/4479667/5db21142-4990-11e4-953e-7a7d2a2a9dd0.PNG)

What do you think?