Add some maps, related to iri_gazebo_worlds worlds

maps/brl.yaml

+image: brl.pgm
+resolution: 0.200000
+origin: [-48.4, -8.5, 0.0]
+negate: 0
+occupied_thresh: 0.65
+free_thresh: 0.196
+

maps/brl_small.yaml

+image: brl_small.pgm
+resolution: 0.100000
+origin: [-44.0, -9.1, 0.0]
+negate: 0
+occupied_thresh: 0.65
+free_thresh: 0.196
+

maps/fme_door_open.yaml

+image: fme_door_open.pgm
+resolution: 0.100000
+origin: [-21.000000, -21.000000, 0.000000]
+negate: 0
+occupied_thresh: 0.65
+free_thresh: 0.196
+

maps/rooms.yaml

+image: rooms.pgm
+resolution: 0.100000
+origin: [-17.800000, -5.000000, 0.000000]
+negate: 0
+occupied_thresh: 0.65
+free_thresh: 0.196
+