Merge branch 'master' into tests_update

examples/injection_examples/basic_tutorial.py

examples/injection_examples/change_sampled_parameters.py

examples/injection_examples/create_your_own_source_model.py

...tion_examples/create_your_own_time_domain_source_model.py

examples/injection_examples/how_to_specify_the_prior.py

examples/injection_examples/marginalized_likelihood.py

examples/injection_examples/sine_gaussian_example.py

examples/open_data_examples/GW150914.py

test/waveform_generator_tests.py

tupak/core/sampler.py

tupak/gw/conversion.py

tupak/gw/detector.py

tupak/gw/likelihood.py

tupak/gw/utils.py

tupak/gw/waveform_generator.py