ros-tutorials: updating to 0.4.1

The ros-tutorials recipe are updated to 0.4.1 to be in line with
https://github.com/ros/rosdistro/blob/bb9ffa139d8f1b251cca3c29c458c19ccb25e5d1/hydro/release.yaml.
adding boost-python support for cv-bridge

The ROS package cv_bridge needs the Boost.Python library. This
commit adds a bbappend file that includes Boost.Python in the
boost recipe.
The included lines are commented out in the boost recipe in the
OpenEmbedded-Core repository.
cv-bridge: initial commit
image-transport-plugins: initial recipes from Andreas Hildisch