Evolutionary model bibcodes not being added to `refs` dictionary

[SherelynA]

I feel like this info is somewhere, and if it is I think it should be easier to find what the references are for the evolutionary models. @hover2pi you probably have a better idea about if this is somewhere in the code. I think we should make it so that the reference for the evolutionary model is added to the sed the moment you choose one.

[hover2pi]

It's just the references to the publications for now. You can see the references used for a given SED by calling the s.refs attribute. When you add data or use an evo or atmo model, it adds the reference to the refs dictionary. Were you looking for something more like documentation?

[SherelynA]

@hover2pi, yes it adds the evo model to the s.refs but it doesn't add the reference itself for the evo model to s.refs. So for example, it would say the bibcode for the evolutionary model being used.

[hover2pi]

@SherelynA Oh, we need to add that then. For the time being, the nc_solar_age evo model reference should be:

D. Saumon and M. S. Marley. The Evolution of L and T Dwarfs in Color-Magnitude Di- agrams. Astrophysical Journal, 689(2):1327–1344, dec 2008. doi: 10.1086/592734. URL http://dx.doi.org/10.1086/592734.