Merlin Fisher-Levine would you mind looking at this? We've added tests and sorted out the camera yaml file. I think I'd rather the addition of tests to ci_lsst be done on a different ticket (and preferably by someone else). Merging this to obs_lsst won't affect other people.

I can do the review

The code looks good. I'm still looking at adding some of the data to ci_lsst, but this need not prevent us from merging

Merged. Thank you Robert Lupton for the review and thank you Craig Lage for starting this off with some code and helping out with my changes.