fix PageHash#has_key?
fix PageHash#has_key?

niuli1991/anemone,brutuscat/medusa,paresharma/medusa,shinvdu/anemone,Pheonix7284/anemone,balusamy/anemone,balusamy/anemone,LeonidMorozov/anemone,dfockler/anemone,yurakawa/anemone,chriskite/anemone,balusamy/anemone,withelmo/anemone