Support for starting a new game at any time

![screenshot from 2013-05-04 18 30 01](https://f.cloud.github.com/assets/1317310/463097/f7a6a3aa-b51a-11e2-97cb-e188315c6815.png)

This fixes https://github.com/mfabel/gtktactoe/issues/2. I should mention that the this commit seems to affect the verbosity option, and that it breaks the way that you had the application close. Additionally, I just now noticed that it is not tabbed correctly on every line.

Anywho, just thought I'd share that I got it working. I understand if you don't think it is ready to merge yet.