Inconsistencies / code smells

[AlexanderFabisch]

• [ ] some parameters are given as environment variables (BL_SEED, BL_LOG_PATH, BL_CONF_PATH), some are read from learning_config.yml
• [x] some environments don't use BL_CONF_PATH: CEC13, FunctionApproximation, MarsEnvironment / this will be addressed with #41
• [x] there is commented code in MountainCar
• [x] ... and in the Controller
• [x] ~~there is no behavior search in C++~~
• [ ] sometimes it would be good to use smart pointers

[malter]

• The BL_CONF_PATH is used to define where to find the learning_config.yml, all environment should use the environment variables.
• The learning_config.yml defines the configuration for a learning application. While the environment variables can define parameters for single learning runs. Like when performing a learning application changing the log folder every run without overwriting the learning_config.yml.
• I will check the commented Code and remove it.
• The C++ behavior search implementations aren't open source yet.
• We can discuss where we should use smart pointers, they are not always necessary. ;-)