Merge branch 'issue#4' into 'master'

.gitlab-ci.yml

src/broker/cloud_broker.cpp

src/json_workload.cpp

src/queue.cpp

src/queue.hpp

test/expected_log/bin_packing-2machines-para_homo_jobs.csv

...ected_log/bin_packing_energy-2machines-para_homo_jobs.csv

test/expected_log/broker-bpNRJ-2machines-para_homo_jobs.csv

test/expected_log/cocktail_user_model-2machines_jobs.csv

...ected_log/fb_user_think_time_only-many_following_jobs.csv

...ected_log/fb_user_think_time_only-many_preceding_jobs.csv

..._log/fb_user_think_time_only-many_start_sessions_jobs.csv

...xpected_log/multicore_filler-2machines-para_homo_jobs.csv

test/expected_log/routine_greedy-2machines_jobs.csv

test/helper.py

test/test_broker.py

test/test_schedulers_multi.py