Added in moon option for plot_airmass

[cagostino]

I think this would be a useful feature to have in plot_airmass as it's easily calculable just with the information given and I think this would be a common enough calculation people have to do that it would be worth having to save a little bit of time.

[wtgee]

@cagostino any way you can clean this up and get submitted? If you don't have time let me know. I'm at a hack-week this week and might try to clean up some of the airmass plots so would just incorporate this. Same with #354

[cagostino]

@wtgee yeah probably. I was not exactly sure what to do with #354 since its checks were no longer working and weren't showing any details as to why. Would be happy to get that one through though.

[cagostino]

I fixed what you had suggested previously, let me know if there is anything else I can do to move this along @wtgee

[wtgee]

I fixed what you had suggested previously, let me know if there is anything else I can do to move this along @wtgee

Thanks! There's a conflict in one of the files still, if you could clean that up @bmorris3 can then take a look for merging.