Muons

Added information to full chain for the cosmic ray muon background using an approximation from IC86 Corsika files and Muon Gun weights
We need to keep the `**kwargs`. These are important, as the we quite often create the services by just throwing __all__ parameters at them, as in
```
reco_service = RecoService(ebins, czbins, **params)
```
See `TemplateMaker.py` for an example.

Also, I think `muon_scale` is not needed here, see discussion on slack.