Changed Person.msg as part of face_rec overhaul, removed unused mood field

msg/Person.msg

 string name
 string gender
 float32 age
-string mood
-string shirt_color
+sensor_msgs/Image shirt_image
+float32[4] bounding_box
 geometry_msgs/PoseStamped pose
 homer_msgs/Face face
 homer_msgs/HumanPose human_pose