added more examples

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handling of disabled currencies for poloniex

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cryptopia FUEL → FC2 (FuelCoin != FUEL)

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minor typo in recent fix ccxt#875

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no market depth for bittrex fix ccxt#875

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southxchange trading fees

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acx trading fees

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added missing kucoin files fix ccxt#874

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new okcoin metainfo

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added withdraw to ok* family fix ccxt#872

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