added policy evaluation and gridworld domain
typo fixed in LSTD and policy mixtures added
added copy method for gridworld
fixed argument ordering issue in LSTD
fixed default transition model in gridworld
fixed missing terminal attr in gridworld
fixed missing terminal attr in gridworld
fixed boundary check in gridworld
fixed LSTD trying to solve singular matrices
fixed mixture of policies
fixed typo in linear value function
added temp debug code in linear value fun
added temp debug code in linear value fun
added temp debug code in linear value fun
fixed lstd returning tuple instead of array, removed value fn debufg code
fixed problem in discrete rv in policy
small tweak in gridworld
added  None state when terminating in gridworld
merged dev branch