Fix CMakeLists.txt + remove warnings due to ros.

CMakeLists.txt

include/dynamic_graph_bridge/ros_init.hh

include/dynamic_graph_bridge/sot_loader.hh

package.xml

src/CMakeLists.txt

src/robot_model.cpp

src/ros_queued_subscribe.cpp

src/ros_queued_subscribe.hh

src/ros_subscribe.cpp

src/ros_subscribe.hh

src/sot_to_ros.hh