Add tokenizer exception for 'Ph.D.', to fix 592.
Add tokenizer exception for 'Ph.D.', to fix 592.

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