Launchpad ingestion to archive endpoint

Wire up launchpad ingestion to charmstore filling out new api/models.
Done.

I agree that the functionality would be nice. I feel that it is easier than it sounds. Which config file? $GOPATH/src/github.com/juju/charmstore/cmd/charmd/config.yaml or /etc/charmd.yaml (as CI runs using that path) Should we take config file path as cmd arg?