modified:   TODO
new todo about feat_num
new file:   hunvec/seqtag/seq_dataset.py
dataset for that need
modified:   hunvec/seqtag/word_tagger.py
using prev dataset
modified:   hunvec/seqtag/word_tagger.py
renamed:    hunvec/seqtag/seq_dataset.py -> hunvec/seqtag/word_tagger_dataset.py
renaming at all level