Added new packages that will contain MapReduce BN learning algorithm
that will be used for performance comparison with the PC algorithm
Work on count processing.
Mapper now generates KVPs where the format now effectively is
((x y Z), (values(x,y,Z), count))
Will make reducer function much easier to write.
can calculate marginals for processed counts reducer
Processed Count Reducer now calculates g2 statistics. Need to calculate
the degrees of freedom.