don't output SystemExit exceptions
don't output SystemExit exceptions

sporkrb/spork,jarmo/spork,Eric-Guo/spork,chrismdp/spork,selenetelenav/spork,paypronl/spork,selenetelenav/spork,jarmo/spork,Eric-Guo/spork,paypronl/spork,sporkrb/spork