Adds a verbose option to VLearners.
Adds val numActions to Domain, and adds the ContinuousDomain trait.
Add the QLearner trait, modify QFunction and Sarsa appropriately.
Add a .gitignore.
Add the ResidualGradient.scala file.
Add the scale function to ContinuousDomain.
Adds the MountainCar.scala and Rectangular.scala files.