def zip_command
      <<-EOH.split.join(" ").squeeze(" ").strip
      7z a -r
      #{windows_safe_path(staging_dir)}\\#{project.name}.zip
      #{windows_safe_path(project.install_dir)}\\*
      EOH
    end
def zip_command
      <<-EOH.split.join(" ").squeeze(" ").strip
      7z a -r
      #{windows_safe_path(staging_dir)}\\#{project.name}.zip
      #{windows_safe_path(project.install_dir)}\\*
      EOH
    end
Get the shell command to create a zip file that contains
 the contents of the project install directory

 @return [String]