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/how_to_specify_the_prior.py

examples/injection_examples/marginalized_likelihood.py

examples/supernova_example/supernova_example.py

test/detector_tests.py

test/example_tests.py

tupak/__init__.py

tupak/core/prior.py

tupak/gw/conversion.py

tupak/gw/likelihood.py

tupak/gw/prior.py