I just upgraded my dev machine to version 2.0.0 of Vlad the Deployer. I got one unexpected error -- "Please specify the deploy path via the :deploy_to variable" -- but here is how I fixed it:
git support is now a separate gem, so remember to run
sudo gem install vlad-git
I also had some problems when version 1.4.0 was also on my machine, so I uninstalled that one with:
sudo gem uninstall vlad -v "1.4.0"