cartographer

Author	SHA1	Message	Date
Alexander Belyaev	97c039bab2	Move pose_graph_stub/trajectory_builder_stub to internal. (#950 ) [Internal hdrs RFC](https://github.com/googlecartographer/rfcs/blob/master/text/0003-internal-headers.md) Also moved /mapping to /client. Namespace changes will follow.	2018-03-01 18:30:30 +01:00