Use FitViewport in AbstractScreen?

I've updated the game to use libGDX 1.0

One of the changes in libGDX are the different viewports. At the moment I've used StretchViewport to keep the game how it was, but you can use FitViewport instead which causes black bars to appear on foreign sized monitors. What does everyone think?

(You should be able to switch to / checkout the "fit-viewport" branch to test this from git)