gazebo_ros_pkgs: use GetMaxStepSize() for the Gazebo simulation period
Merge pull request #143 from meyerj/patch-1

gazebo_ros_pkgs: use GetMaxStepSize() for the Gazebo simulation period
gazebo_ros_control: call writeSim() for each Gazebo world update independent of the control period
gazebo_ros_control: added GazeboRosControlPlugin::Reset() method that resets the timestamps on world reset
Merge remote-tracking branch 'meyerj/hydro-devel' into hydro-devel
Merge remote-tracking branch 'meyerj/fix-125' into hydro-devel