Fixed some of the issues that came up during restructuring

examples/injection_examples/basic_tutorial.py

...injection_examples/basic_tutorial_dist_time_phase_marg.py

...ples/injection_examples/basic_tutorial_time_phase_marg.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/open_data_examples/GW150914.py

examples/open_data_examples/GW150914_minimal.py

examples/other_examples/hyper_parameter_example.py

examples/other_examples/sine_gaussian_example.py

examples/supernova_example/supernova_example.py

examples/tutorials/compare_samplers.ipynb

examples/tutorials/making_priors.ipynb

examples/tutorials/visualising_the_results.ipynb

test/waveform_generator_tests.py

tupak/core/utils.py