Don't try or warn about removals if reallyrm is set to nil
Don't try or warn about removals if reallyrm is set to nil

At least one user wants to develop plainly in the working directory of
the project, without having their code be in git repositories. I hadn't
considered this use case, but I think it's valid. As a result, if you
set the `reallyrm` yaml variable to nil (string nil works fine), then
OMV won't ever `rm` your files or even bug you to "please rm" the
untracked files.

bhalothia/oh-my-vagrant,br0ziliy/oh-my-vagrant,LalatenduMohanty/oh-my-vagrant,LalatenduMohanty/oh-my-vagrant,mairin/oh-my-vagrant,goern/oh-my-vagrant,goern/oh-my-vagrant,LalatenduMohanty/oh-my-vagrant,goern/oh-my-vagrant,gpjonesii/oh-my-vagrant,geekcheng/oh-my-vagrant,mairin/oh-my-vagrant,bhalothia/oh-my-vagrant,purpleidea/oh-my-vagrant,gpjonesii/oh-my-vagrant,purpleidea/oh-my-vagrant,br0ziliy/oh-my-vagrant,mairin/oh-my-vagrant,geekcheng/oh-my-vagrant,geekcheng/oh-my-vagrant,br0ziliy/oh-my-vagrant,gpjonesii/oh-my-vagrant,purpleidea/oh-my-vagrant,bhalothia/oh-my-vagrant