Merge pull request #141 from moresun/hydro-devel

Gazebo ROS joint state publisher added
Update package.xml

Add new maintainer.
Fix a link on the readme
Fix build with gazebo4 and indigo
Fix to work with gazebo3
Update for hydro + gazebo 1.9
Removed a few warnings
Reduced changes
Fixed boost any cast
Update default_robot_hw_sim.cpp
Merge pull request #221 from ros-simulation/fix_build

Fix build for gazebo4
Update changelogs for the upcoming release
2.3.6