Launchpad ingestion to archive endpoint

Wire up launchpad ingestion to charmstore filling out new api/models.

UPDATE

QA instructions:

1. Make sure your dependencies are up to date, run make reps
2. Run mongodb. I use system mongodb
3. Run charmd using go run: go run cmd/charmd/main.go cmd/charmd/config.yaml &
4. Run charmload using go run: go run cmd/charmload/main.go --staging=true --show-log --logging-config='&lt;root&gt;=TRACE'
5. Optionally omit the --staging=true option to use production launchpad.

And, when I follow these instructions on a clean utopic system, I get same errors mentioned by @bac and @urosj so I'm keeping this blocked until I resolve them.  No idea, yet, why it WFM on a different system.
It will only fail if the url isn't able to be parsed. That url could be specified with cmd line option and could be wrong. Thanks, good catch.

Done.