Merge remote-tracking branch 'origin/master' into resolve-174

.gitlab-ci.yml

cli_tupak/plot_multiple_posteriors.py

examples/injection_examples/binary_neutron_star_example.py

examples/injection_examples/using_gwin.py

...her_examples/linear_regression_pymc3_custom_likelihood.py

setup.cfg

setup.py

test/calibration_tests.py

test/conversion_tests.py

test/detector_tests.py

test/gw_likelihood_tests.py

test/likelihood_tests.py

test/prior_tests.py

test/waveform_generator_tests.py

tupak/core/__init__.py

tupak/core/likelihood.py

tupak/core/prior.py

tupak/core/result.py

tupak/core/sampler.py

tupak/core/utils.py