Merge branch 'master' into project_restructuring

docs/likelihood.txt

examples/other_examples/gaussian_example.py

examples/other_examples/linear_regression.py

examples/other_examples/linear_regression_unknown_noise.py

examples/other_examples/sine_gaussian_example.py

examples/supernova_example/MuellerL15_example_inj.txt

examples/supernova_example/SupernovaImagPCs.txt

examples/supernova_example/SupernovaRealPCs.txt

examples/supernova_example/supernova_example.py

test/example_tests.py

tupak/detector.py

tupak/result.py

tupak/source.py

tupak/utils.py