Minor fixes in IO store file backend.

Signed-off-by: marco.minetti <marco.minetti@novetica.org>
Minor fixes in cache.server.js.

Signed-off-by: marco.minetti <marco.minetti@novetica.org>
Added support for commenting test scripts from series.

Signed-off-by: marco.minetti <marco.minetti@novetica.org>
Minor changes to tests.

Signed-off-by: marco.minetti <marco.minetti@novetica.org>
Added IO cache tests.

Signed-off-by: marco.minetti <marco.minetti@novetica.org>