added rex_log_file
fixed rex_logger_debug
fixed rex_log_file
added docs
added test for rex_log_entry
log rotation
performance improvement
use i18n
rex_log_file::__construct: check dir
added test for rex_log_file
use rex_log_file for cronjob log
fixed rex_logger_debug
more test assertions
added comments
Merge pull request #192 from redaxo/log-file

ErrorLog Absichern