Fix for issue #70: running tests without first building fails

This uses the `DEPENDENCIES` argument added in `roslaunch` v1.9.55 to declare dependencies on the targets used in the roslaunch tests.

Tested on Hydro.

Commits updating the support packages in `fanuc_experimental` with the same changes will follow after acceptance of this PR.

I'm certainly not defending this, as `industrial_robot_client` should be fixed, but this seems rather fragile to have to include the prefix.  Once we fix `industrial_robot_client`, this will break.  Perhaps it's not something we have control over since this seems to be a `roslaunch_add_file_check` issue.