Hi @Ceki Gülcü,

I changed the SizeAndTimeBasedArchiveRemover to fix the problem of not deleting the non-archived log files of the maxHistory expired directories. 

I changed the stemRegex from list all files of the folder instead of only archived. 

IMHO If folder is expired from the maxHistory perspective then ideally we should delete the all contents of it.

Please review the pull request

https://github.com/qos-ch/logback/pull/420