Merge pull request #80 from AnarchyTools/system-exit

Don't print stack trace for user-visible subcommand errors
4 jobs for plugins
Status Job ID Name Coverage
  Build
passed #2957
docker
linux

00:00:37

passed #2958
openswift
osx

00:00:29

passed #2943
docker
linux

00:00:37

passed #2944
openswift
osx

00:01:09