public StageBuildDirectory CreateBuildDir(string prefix)
 {
     string buildDir = Path.Combine(_settings.Env.BuildsDirectory,
         string.Format("{0}_{1}",
             prefix.Replace("/", "").Replace("\\", ""),
             Path.GetFileNameWithoutExtension(Path.GetTempFileName())));
     var dir = new StageBuildDirectory(buildDir);
     dir.Create();
     return dir;
 }