Proposed new messages to replace IMU message.

ros / common_msgs

Commonly used messages in ROS. Includes messages for actions (actionlib_msgs), diagnostics (diagnostic_msgs), geometric primitives (geometry_msgs), robot navigation (nav_msgs), and common sensors (sensor_msgs), such as laser range finders, cameras, point clouds.

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From https://groups.google.com/forum/#!topic/ros-sig-drivers/2NvgNBOjcFQ

Also connected to ros-infrastructure/rep#95

I'm opening this for more review and to restart the discussion.

I see that we need a few things to be implemented before this can be merged.

[ ] homogenize this with the REP 145 proposal, ros-infrastructure/rep#95
[ ] Implement some python methods to convert forward and backwards between the old IMU message and the trio of new messages. And a node that can used to convert each way.
[ ] Provide an IMU transport lib (in c++ and python) that will provide the necessary synchronization helper methods to handle the parallel transport in a way that keeps things synchronized.

ros / common_msgs

Proposed new messages to replace IMU message. #101