Aggregate Foxy Message API Review comments. (#86)
Aggregate Foxy Message API Review comments. (#86)

* Aggregate Foxy Message API Review comments.

Signed-off-by: Tully Foote <22715502305f5acc3bd5bf22a9c406e70a1e1348@osrfoundation.org>

ros2/common_interfaces,ros2/common_interfaces