Add print_word_probabilities command line argument
Add print_word_probabilities command line argument

cshanbo/nematus,cshanbo/nematus,shuoyangd/nematus,EdinburghNLP/nematus,yang1fan2/nematus,Proyag/nematus,rsennrich/nematus,yang1fan2/nematus,EdinburghNLP/nematus,yang1fan2/nematus,cshanbo/nematus,shuoyangd/nematus,yang1fan2/nematus,Proyag/nematus,Proyag/nematus,yang1fan2/nematus,rsennrich/nematus,EdinburghNLP/nematus,rsennrich/nematus,shuoyangd/nematus,yang1fan2/nematus,yang1fan2/nematus,rsennrich/nematus,yang1fan2/nematus,rsennrich/nematus,yang1fan2/nematus,EdinburghNLP/nematus,rsennrich/nematus,cshanbo/nematus,EdinburghNLP/nematus,shuoyangd/nematus,Proyag/nematus,shuoyangd/nematus,shuoyangd/nematus,cshanbo/nematus,Proyag/nematus,cshanbo/nematus,EdinburghNLP/nematus,Proyag/nematus,yang1fan2/nematus