\begin{frame}{Workflow in a Team}
  Mercurial scales from a single team\dots:
  \begin{center}
    \begin{tikzpicture}
      \tikzstyle{every node}=[repository, minimum height=18mm, text width=12mm]
      \tikzstyle{every path}=[<->, short]

      \node (a) at (120:2) {Alice};
      \node (b) at (240:2) {Bob};
      \node (c) at (  0:2) {Carla};

      \node[right=of c] (t) {Test};
      \node[right=of t] (p) {Prod};

      \draw[short, <->] (a) -- (c);
      \draw[short, <->] (b) -- (c);
      \draw[short, <->] (c) -- (t);
      \draw[short, <->] (t) -- (p);
    \end{tikzpicture}
  \end{center}
\end{frame}