Merge pull request #59 from bulwahn/master

adding some runtime dependencies
catkin.class: adding package.xml to the shipped packages for rosversion

The rosversion command requires that the package.xml are available at
run time. The rosversion command is used when starting roscore.
roslaunch: improving runtime dependency
core-image-ros-groovy-running-roscore: augmenting hosts and tuned
Merge http://github.com/bmwcarit/meta-ros