Fix the bug of having -100000 or 10000 rewards sometime.

backends/controller_base.py

backends/kerasrl_learner.py

...nds/trained_policies/halt/immediatestop_weights_actor.h5f

...ds/trained_policies/halt/immediatestop_weights_critic.h5f

config.json

env/env_base.py

env/simple_intersection/road_geokinemetry.py

env/simple_intersection/simple_intersection_env.py

options/options_loader.py

options/simple_intersection/maneuver_base.py

options/simple_intersection/maneuvers.py