Usage on windows

[174n]

Hi, thank you for an awesome project. I have an issue running it on windows though.

Here is the command, I'm running:

python multicast-relay.py --interfaces 10.8.0.4/24 "Ethernet" --relay 224.0.2.60:4445

And the error I'm getting:

AttributeError: module 'os' has no attribute 'fork'

[alsmith]

Adding a --foreground flag would be the best work-around.