Merge branch 'develop'

.gitignore

CMakeLists.txt

cmake/_dependencies.cmake

cmake/_sources.cmake

docs/images/Tutorial1.png

docs/images/Tutorial2.png

docs/images/Tutorial3.png

docs/images/Tutorial4.png

docs/images/Tutorial5.png

docs/images/Tutorial6.png

docs/linux_notes.txt

include/attributes/loggable.hpp

include/attributes/renderable.hpp

include/cuda/odf_field.h

include/cuda/orthtree.h

include/cuda/spherical_histogram.h

include/cuda/vector_field.h

include/io/hdf5_io.hpp

include/io/hdf5_io_2.hpp

include/io/hdf5_io_base.hpp