git pushMerge branch 'master' of https://github.com/dennybritz/seq2seq into bug/train-overwrite-vocab
git pushMerge branch 'master' of https://github.com/dennybritz/seq2seq into bug/train-overwrite-vocab

liyi193328/seq2seq,kontact-chan/seq2seq,chunfengh/seq2seq,shashankrajput/seq2seq,kontact-chan/seq2seq,shashankrajput/seq2seq,liyi193328/seq2seq,google/seq2seq,kontact-chan/seq2seq,google/seq2seq,google/seq2seq,chunfengh/seq2seq,chunfengh/seq2seq,kontact-chan/seq2seq,liyi193328/seq2seq,shashankrajput/seq2seq,google/seq2seq,liyi193328/seq2seq,chunfengh/seq2seq,liyi193328/seq2seq,shashankrajput/seq2seq