Feature/dynamic map size

homer_mapping/config/homer_mapping.yaml

-/homer_mapping/size: 40                                          # size of one edge of the map in m. map is quadratic
+/homer_mapping/size: 4                                          # size of one edge of the map in m. map is quadratic
 /homer_mapping/resolution: 0.05                                  # m meter per cell
 /homer_mapping/max_laser:  20.0                                   # m max range for including range into map