added missing dependencies for message generation

[Acuda]

No description provided.

[JanezCim]

Thank you for your contribution :)
I dont see how this is necessary, since this line

fiducials/fiducial_slam/package.xml

Line 24 in 627e6c6

<depend>fiducial_msgs</depend>

makes sure those dependencies are met. So even if I try to compile fiducial_slam with
catkin_make --only-pkg-with-deps fiducial_slam
there still will be no error. Do you have a specific use-case where those changes are necessary?

[Acuda]

not a real specific use-case, also as suggested here http://wiki.ros.org/ROS/Tutorials/CreatingMsgAndSrv#Using_msg or for the srv/AddFiducial.srv case http://wiki.ros.org/ROS/Tutorials/CreatingMsgAndSrv#Using_srv message generation is recommend.

[...]We need to make sure that the msg files are turned into source code for C++, Python, and other languages[...]

the specific use-case is "other languages", in detail: message generation for java. but nevertheless, according to the links above i think message generation is still missing. but i am also fine to use my branch, i can build it. just thought you (and others?) where also interested in the changes i made. :)