Don't assume old option names in fill_options
Don't assume old option names in fill_options

In fill_options(), process Theano-to-Tensorflow name changes before
checking for missing values.

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