rtt_rosnode: do not fail when no rosmaster is available, only warn, to make the deployer happy

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
Releasing 2.6.0-0

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
scripts: make create_boost_headers.py script compatible with groovy

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
cmake: add find_package(roscpp) to pick ros version flags for groovy rtt_msgs packages, silenty fails for fuerte

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
new release: adds groovy support

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
Merge branch 'master' of http://git.mech.kuleuven.be/robotics/rtt_ros_integration