use picklable bidict
(backend) saving and loading pipelines to files
(frontend) saving and loading pipelines to files
callback handler for graceful pipeline exit
implemented log_handler via a CallbackHandler
fixed double stopping
(backend) implemented pipeline deletion
(frontend) implemented pipeline deletion, closes #13
(backend) new pipeline creation functionality
(frontend) new pipeline creation functionality
cleanup
Merge pull request #14 from belevtsoff/master

Update minlib branch