Hits and Google PageRank

Description:
->Calculates Hubs and Authority values and PageRank values based on the input graph, iteration and initial value.
->Iteration value -1 to -6 define the error rate as 10^-1 to 10^-6 respectively which means that the calculations stop
    after the error rate reaches upto the precision specified.
->Iteration value greater than 0 define the number of iteration.
->Initial value of -1 and -2 initializes the starting values as 1/N and 1/sqrt(N) respectively where N is the number of webpages
->Initial value of 0 or 1 initializes the starting values as 0 or 1.
->The code is documented for reference.