Control robot with joystick and save map with button A.
Update README.md

Extended the README.md with instructions on how to use the map_saver package with the joypad.
Programm to create waypoints by driving the robot there and pressing the A button. Will be saved to a file for later use.
Fixes issue #2.
Merge branch 'master' of https://github.com/strands-project/autonomous_patrolling
Fixed joystick device issue and autorepeat parameter for continuous cmd_vel message publishing
Included the joystick fixes from the rumblepad_control node in the two other nodes.
Update README.md

Added instructions in the README.md for saving points.