Add TeVCat

TeVCat ( http://tevcat.uchicago.edu/ ) is an online catalog of TeV gamma-ray sources that is continuously updated and I would like to add it to astroquery.

I already have code to make astropy tables from their JSON data.
At the moment I do `View -> Developer -> JavaScript Console` in the Chrome browser and type `jsonData`.
The one thing I don't know how to do is how to get the data from Python.
@keflavich Do you know how to do that? Wout `TeVCat` be acceptable for `astroquery` or do you think it's too niche?


Here I'm not sure how to prepare the input file for local tests.

If the full HTML file (~ 1 MB) is OK to put in the repo, it's simple, but if I should select a subset of the data you mean do it in an interactive Python session, encoding that part of the data again and pasting it back in with an editor?
Or just store some of the decoded JSON data and not test the html scraping and decoding?