Will generate different Markdown for my regular classes,
enumerated types, and error types.
Found out that 'from enum import IntEnum' pulls IntEnum
into the astronomy module and causes us to try to generate
documentation for it. Just keep it in the enum module.
Removed spurious dump of JavaScript README.md when verify_clean
fails.
It is tripping up in verify_clean, saying something has changed.
But I don't know what the problem is.
Adding 'git diff' to see if that gives me any clues.
Git seems to return different exit codes on every system I try.
So now I'm just looking at whether 'git status --porcelain'
emits any text or not, without paying any attention to its exit code.
Very simply, use git command to confirm there were no unexpected
modifications. In particular, if the checked in generated source
doesn't match what got written by the generate program, this will
fail the Travis CI build.
