Add files for manuals and tutorials / Changes for Gazebo head camera emulation (#350) * increase retry time * gz.test: set verbose to launch nextage_world.launch * time-limit 10 is too small for hz test * move ar marker model files to nextage_gazebo/models from nextage_moveit_config/models * mod name CAMERA_HEAD_R/L, remove CATKIN_IGNORE (forgot to add/rm them) * [Gazebo] Missing dependency for using camera plugin. * [Gazebo] Unwind the frequency test.
hz requirement for Gazebo sensor plugin on Travis CI needs to be generous. There's a known issue about Gazebo's sensor frequency https://bitbucket.org/osrf/gazebo/pull-requests/2502/make-sure-cameras-fps-is-strictly-applied/diff and with the lack of GPU or higher CPU, the sensor output is significantly slow on Travis CI.
Contributors: Isaac Saito, Kei Okada, Yosuke Yamamoto