Implement & Train two car behaviors

[sleighsoft]

• [ ] Racing Car: This car should get as far as possible in the shortest amount of time.
• [ ] Conservative Car: This car should stay on the optimal path at all times (the path between consecutive track centers)

Train these models before Monday (11.27.17) so we can show them at the next meeting. Train them using the same GAME_SEED (so same track is generated)

Models are automatically saved to save_path in racing.json. Use different save_path directories for the cars :)