Unstaging staged files

[phlax]

If you do add/fetch and stage something it would be good to have a way to unstage them if you made a mistake

[dwaynebailey]

Is this really 0.2? Feels like it should be in 0.1, not sure if its hard though.

[phlax]

well it looks like things are gonna be a bit delayed so we can bring this back to 0.1