Added .DS_Store to the .gitignore
Implemented the PolicySampler class which is used to collect a set of samples
Added a policy evaulation method to the PolicySampler class. Returns the average rewards over a number of episodes for a given policy
Added a print out when the LSPI terminates due to non-convergence within the maximum number of iterations
As a test Main compares a random policy to one learned with LSPI, however, at the moment it doesn't work because the basis function provided always returns the same number