Add catkin package(s) to provide the default version of Gazebo - take II (kinetic-devel) (#571)

* Added catkin package gazebo_dev which provides the cmake config of the installed Gazebo version

Conflicts:
        gazebo_plugins/package.xml
        gazebo_ros/package.xml
        gazebo_ros_control/package.xml

* gazebo_plugins/gazebo_ros: removed dependency SDF from CMakeLists.txt

The sdformat library is an indirect dependency of Gazebo and does not need to be linked explicitly.

* gazebo_dev: added execution dependency gazebo