Rebase from 'upstream'

README.md

homer_map_manager/CHANGELOG.rst

homer_map_manager/package.xml

homer_mapnav_msgs/CHANGELOG.rst

homer_mapnav_msgs/package.xml

homer_mapping/CHANGELOG.rst

homer_mapping/package.xml

homer_nav_libs/CHANGELOG.rst

homer_nav_libs/CMakeLists.txt

homer_nav_libs/package.xml

homer_nav_libs/src/Explorer/Explorer.cpp

homer_navigation/CHANGELOG.rst

homer_navigation/package.xml

homer_navigation/src/homer_navigation_node.cpp

tracks.yaml