Add support for Erfurts background jobs.
Added console client and an example extension for testing Erfurts worker.
add shebang and set exec flag
Extend default configuration by worker settings (disabled by default).
Allow no use of SMTP auth in mail extension.
Extend default configuration by worker settings.
forward Erfurt
Updated mail extension to fit with updated worker interface.
Update worker shell client demo to fit updated worker interface.
Update mail extension and cleanup shell scripts.
doc and cs issues
switch test job to test
Merge branch 'feature/worker' into develop
forward erfurt