sdformat 9.0.0.tar.bz2

Ros gazebo编译需要的SDFormat依赖,9.0版本release版本,使用cmake编译,前置依赖为:`sudo apt-get install ruby-dev build-essential libtinyxml-dev libboost-all-dev cmake mercurial pkg-config` `sudo apt-get install libignition-transport9-dev libignition-math6-dev libignition-msgs6-dev`