update theano_tf_convert script to convert models with layer normalization
update theano_tf_convert script to convert models with layer normalization

EdinburghNLP/nematus,EdinburghNLP/nematus,rsennrich/nematus,rsennrich/nematus,EdinburghNLP/nematus,rsennrich/nematus,EdinburghNLP/nematus,EdinburghNLP/nematus,rsennrich/nematus,rsennrich/nematus,rsennrich/nematus,EdinburghNLP/nematus