Fix unresolved simple_message symbols at link time

While building against Hydro with catkin_make_isolated this issue appears [1].
As a temporary workarround we need to add simple_message explicitly on each
binary using it

[1]https://github.com/ros-industrial/industrial_core/issues/68#issue-25999936
Merge pull request #30 from Samsagax/hydro-devel-fix-sm-linking

Fix unresolved simple_message symbols at link time
Add irb1600_12 model urdf's

Initial commit of irb1600_12 model without meshes. Dimensions where taken
from Product Specification
Add irb 1600 visual and collision STL models
Merge branch 'hydro-devel-add-irb-1600' of github.com:Samsagax/abb into hydro-devel-add-irb-1600