* Fix assign_tag in doc.merge
* Fix assign_tag in doc.merge

Gregory-Howard/spaCy,raphael0202/spaCy,aikramer2/spaCy,wbwseeker/spaCy,raphael0202/spaCy,honnibal/spaCy,spacy-io/spaCy,honnibal/spaCy,explosion/spaCy,honnibal/spaCy,explosion/spaCy,oroszgy/spaCy.hu,oroszgy/spaCy.hu,banglakit/spaCy,wbwseeker/spaCy,recognai/spaCy,spacy-io/spaCy,wbwseeker/spaCy,aikramer2/spaCy,Gregory-Howard/spaCy,raphael0202/spaCy,raphael0202/spaCy,explosion/spaCy,oroszgy/spaCy.hu,spacy-io/spaCy,wbwseeker/spaCy,aikramer2/spaCy,pombredanne/spaCy,Gregory-Howard/spaCy,Gregory-Howard/spaCy,raphael0202/spaCy,Gregory-Howard/spaCy,raphael0202/spaCy,spacy-io/spaCy,pombredanne/spaCy,recognai/spaCy,banglakit/spaCy,wbwseeker/spaCy,banglakit/spaCy,banglakit/spaCy,Gregory-Howard/spaCy,banglakit/spaCy,banglakit/spaCy,recognai/spaCy,recognai/spaCy,pombredanne/spaCy,oroszgy/spaCy.hu,spacy-io/spaCy,aikramer2/spaCy,oroszgy/spaCy.hu,wbwseeker/spaCy,recognai/spaCy,explosion/spaCy,oroszgy/spaCy.hu,recognai/spaCy,explosion/spaCy,explosion/spaCy,honnibal/spaCy,aikramer2/spaCy,pombredanne/spaCy,spacy-io/spaCy,aikramer2/spaCy