Added dependency to prevent missing msg header, cleaned up CMakeLists
Minor print modification
Removed searching for plugins under 'gazebo' pkg because of rospack warnings
Moved gazebo_interface.py from gazebo/ folder to gazebo_ros/ folder
Actually we need __init__.py
install diff_drive and skid_steer plugins
export diff drive and skid steer for other catkin packages
making RobotHWSim::initSim pure virtual
Merge pull request #63 from piyushk/patch-1

install diff_drive and skid_steer plugins
Merge pull request #64 from jhu-lcsr-forks/hydro-devel

making RobotHWSim::initSim pure virtual
Merge pull request #61 from ros-simulation/no_gazebo_pkg

No gazebo pkg
Merge pull request #62 from ros-simulation/move_python_pkgs

Moved gazebo_interface.py from gazebo/ folder to gazebo_ros/ folder
Merge pull request #59 from ros-simulation/CMake_Tweak

Added dependency to prevent missing msg header, cleaned up CMakeLists
Merge branch 'hydro-devel' of https://github.com/osrf/gazebo_ros_pkgs into hydro-devel