GitLab

* Composer restart (#107)

* added comoser restart from initial assumption

* fixed tests

* added tests for composer restart endpoint

* refactored DatasetAddResource endpoint, splitted get_datasets_names function

* added history merging

* fix first pipleine request error

* updated pytest fixtures

* fix tkinter issue by moving run_composer in separate process

* added golem history visualization

* changed multiprocessing spawn method

* added non ml graphs visualization

* specified pipeline controller exceptions