Function File: redundancy (code_word_list, symbol_probabilites)

Computes the wasted excessive bits over the entropy when using a particular coding scheme. For example

                   prob_list = [0.5 0.25 0.15 0.1];
                   min_bits = entropy(prob_list);
                   cw_list = huffman(prob_list);
                   redundancy(cw_list,prob_list)