Update rnn_cell_utils.py

Update text_inputter.py

Fix bug in Vocab.convert_to_wordlist with option reverse_seq=True

Fix loss for transformer

Update README.md

Update README.mt

Replace all gfile.GFile -> misc.open_file

Update writing scheme in BleuMetricSpec

Fix bug (one line)

Fix bug

Recover mode=EVAL and add FORCE_DECODE for further purpose

Update loss related for ModeKeys=EVAL

Remove loss_fns.py

Update decode.py

Add return value: sorted scores for inference (prepare for reranking)