Use argparse to enable some options
Use argparse to enable some options

Fix #51

Now, `--debug`, `--port/-p` and `--exposed` are available.

Note that most probably you will have to add `--exposed` to the command
you use if you run sipa directly in something like a docker container.

fgrsnau/sipa,agdsn/sipa,lukasjuhrich/sipa,lukasjuhrich/sipa,fgrsnau/sipa,agdsn/sipa,MarauderXtreme/sipa,agdsn/sipa,fgrsnau/sipa,MarauderXtreme/sipa,lukasjuhrich/sipa,agdsn/sipa,lukasjuhrich/sipa,MarauderXtreme/sipa