autodetect cert type

[mortya]

ssl-cert-check has issues when run with a directory of mixed cert types. The -t option can't work right. It would be handy if it could autodetect cert types.

I submitted a PR for this, some time back. #37 .

I don't see a response to it. Was that because it needed a corresponding issue? If yes, here it is! If not, is there some problem with it?

Note that I think it's not currently in a mergable state, because of other conflicting changes. Please let me know if I need to rebase and submit a new PR.