Loading pre-create env

Flatland Challenge
2

Hi Filip

I hope the following method does answer your question.

def load_flatland_environment_from_file(file_name):
    rail_generator = rail_from_file(file_name)
    schedule_generator = schedule_from_file(file_name)

    environment = RailEnv(width=1,
                      height=1,
                      rail_generator=rail_generator,
                      number_of_agents=1,
                      schedule_generator=schedule_generator)

    return environment

I tested this method on lastest master trunk. We found yesterday a bug in the load method. The bug is now fixed.

/Adrian