Change the way "Is the classes correct?" is checked

[ickc]

Related to what I described in ickc/pandoc-amsthm#2

Hope that I didn't misunderstand what you want to do.

[coveralls]

Coverage increased (+0.2%) to 93.103% when pulling cd36915 on ickc:master into d521150 on chdemko:master.

[chdemko]

In my code, the lists have been converted to set using the built-in python set function. I expect that the current set is a super set of the defined set. Your code check only if a class is present to add the LaTeX code.

[ickc]

I see. I understood what it is doing, but just don't know it is intentional. Perhaps some more elaborated examples on the use case?

Thanks and I'm closing it.