message: install xargo from git temporarily
diff: @@ -249,7 +249,8 @@ fn setup(ask_user: bool) {
  println!("Installing xargo: `cargo install xargo -f`");
  }
  - if !cargo().args(&["install", "xargo", "-f"]).status()
  + // FIXME: Install from crates.io again once a new xargo got released.
  + if !cargo().args(&["install", "xargo", "-f", "--git", "https://github.com/japaric/xargo"]).status()
  .expect("failed to install xargo")
  .success()
  {
  