Add a simple wrapper for TimeRanges

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Add some documentation

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>
Add a interval to the reply message

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>