Crystal changes for dashing

[shiveshkhaitan]

Address the crystal changes which have not been included in dashing

[chapulina]

Thanks for porting the changes, @shiveshkhaitan ! While testing this, I noticed some instructions were wrong, so I fixed them in 5663c96.

[Karsten1987]

maybe I am doing something wrong here, but this PR made my compilation fail

Starting >>> gazebo_ros      
--- stderr: gazebo_ros                                      
/home/osrf/roscon_ws/src/gazebo_ros_pkgs/gazebo_ros/src/gazebo_ros_state.cpp:21:10: fatal error: gazebo_msgs/srv/get_entity_state.hpp: No such file or directory
 #include <gazebo_msgs/srv/get_entity_state.hpp>
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/gazebo_ros_state.dir/src/gazebo_ros_state.cpp.o] Error 1
make[1]: *** [CMakeFiles/gazebo_ros_state.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
/home/osrf/roscon_ws/src/gazebo_ros_pkgs/gazebo_ros/t

reverting to 3.3.1 makes it work for me. Do I miss something here?

[chapulina]

@Karsten1987, did you compile gazebo_msgs before gazebo_ros?