added karto slam and visualizators

added hector slam, cartographer not working

typo in readme

added move_base_flex implementation and easy rviz configurations

added slam submodule and updated files for bug fixes and slam+navigation

updated pid and xacro

submodules added

submodules removed

new jetbot repo structure

changed bad reference of last video

added more sensors to simulation sonar, odom, gps, imu

hector imu plugin with rviz and gazebo working

clarification for realsense plugin

added rplidar for rviz and gazebo

pointed to correct video