Merge pull request #43 from corentinberge/coverage

include/dynamic-graph/logger.h

include/dynamic-graph/signal-ptr.h

src/debug/logger.cpp

src/mt/process-list.cpp

tests/CMakeLists.txt

tests/custom-entity.cpp

tests/factory.cpp

tests/signal-all.cpp

tests/signal-cast-registerer.cpp

tests/signal-ptr.cpp

tests/signal-time-dependent.cpp