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1.安装方式：
http://www.cnblogs.com/liu-fa/p/5779206.html
2.遇到的问题：
2.1 ERROR：cannot download default sources list from: https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/sources.list.d/20-default.list Website may be down
解决方式：
sudo c_rehash /etc/ssl/certs
sudo -E rosdep init
2.2 ROS运行时错误：IOError: [Errno 13] Permission denied: ‘/home/XXX/.ros/rosdep/sources.cache/index’
sudo chmod 777 -R ~/.ros/