0.3.0

CHANGES:

• server: unstuck waiting workers when a new queue is created for a platform
• server: warn when a worker requests a job for a new platform when a template
  does not exist
• server: improve logging of workers (always prefix uuid)
• worker: kill process group when server communication fails
• worker: collect output on any exit code
• client: observe-latest has optional platform and job_name arguments
• client: execute has an optional platform argument
• Debian and FreeBSD packaging improvements