add graph actor

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
worker_thread is now worker

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
add message API
  Stargate: improve documentation

Link: https://github.com/GeneAssembly/biosal/issues/83
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
add message API
  Stargate: improve documentation

Link: https://github.com/GeneAssembly/biosal/issues/83
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
add message API
  Stargate: improve documentation

Link: https://github.com/GeneAssembly/biosal/issues/83
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
take only the title from json

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>