Merge remote-tracking branch 'origin/master' into add-flake8-checker

examples/injection_examples/using_gwin.py

...her_examples/linear_regression_pymc3_custom_likelihood.py

test/calibration_tests.py

test/detector_tests.py

test/gw_likelihood_tests.py

test/likelihood_tests.py

test/waveform_generator_tests.py

tupak/core/likelihood.py

tupak/core/result.py

tupak/core/sampler.py

tupak/core/utils.py

tupak/gw/calibration.py

tupak/gw/detector.py

tupak/gw/likelihood.py

tupak/gw/waveform_generator.py