Merge branch 'logger_example' into 'master'

examples/GEAR/ZoomIn/zoom_in.yml

examples/Logger/SimpleOrbits/makeIC.py

examples/Logger/SimpleOrbits/mpl_style

examples/Logger/SimpleOrbits/plotSolution.py

examples/Logger/SimpleOrbits/run.sh

examples/Logger/SimpleOrbits/simple_orbits.yml

examples/Planetary/EarthImpact/earth_impact.yml

examples/Planetary/EarthImpact/make_movie_logger.py

logger/examples/reader_example.py

logger/logger_header.c

logger/logger_index.c

logger/logger_particle.c

logger/logger_python_wrapper.c

logger/logger_reader.c

src/hydro/Planetary/hydro_part.h

src/logger.c