rtt_roscomm: ServiceRequesters are managed by shared pointers now

Signed-off-by: Johannes Meyer <johannes@intermodalics.eu>
rtt_roscomm: disambiguate RTT::ServiceRequester constructor call in ROSTopic service requester
rtt_ros: Putting rtt_ros import into library
rtt_roscomm: Moving rtt_rostopic implementation into library
Merge remote-tracking branch 'origin/servicerequester-refactoring' into HEAD
rtt_actionlib: Adding optional arguments to create ROS ports automatically
Update README.md
merge
Merge branch 'gsr-sim-clock' of github.com:jhu-lcsr-forks/rtt_ros_integration into hydro-devel