gazebo_plugins/gazebo_ros: fixed install directories for include files and gazebo scripts
gazebo_plugins: terminate the service thread properly on destruction of a PubMutliQueue object without shuting down ros
gazebo_ros: also support gazebo instead of gazebo_ros as package name for plugin_path, gazebo_model_path or gazebo_media_path exports
Skid steering drive plugin.
Rotation fixed.
Merge pull request #40 from jhu-lcsr-forks/hydro-devel

Eh, we don't have much time before Friday's freeze date.

Adding merged gazebo_ros_control and ros_control_gazebo to gazebo_ros_pkgs
Added args to launch files, documentation
Merge pull request #35 from meyerj/fix_include_directory_installation_target

Header files of packages gazebo_ros and gazebo_plugins are installed to the wrong location
Changed font size
gazebo_ros_api_plugin.h is no longer exposed in the include folder
Merge pull request #41 from ZdenekM/hydro-devel

Added skid steering plugin (modified diff drive plugin).
Merge branch 'hydro-devel' of https://github.com/osrf/gazebo_ros_pkgs into terminate_service_thread_fix

Conflicts:
	gazebo_plugins/include/gazebo_plugins/PubQueue.h
Renamed RobotSim to RobotHWSim
Merge pull request #42 from osrf/api_plugin_no_include

gazebo_ros_api_plugin.h is no longer exposed in the include folder
Merge pull request #33 from meyerj/terminate_service_thread_fix

another fix for terminating the service_thread_ in PubQueue.h
Merge pull request #44 from osrf/robot_hw_sim

Renamed RobotSim to RobotHWSim
Added support for reading <tranmission> tags and other cleaning up
Merge remote-tracking branch 'origin/hydro-devel' into robot_hw_sim
Tweaked README
Made control period optional