fix explode (, $string) → str_split ($string) in check_address in Exc…

…hange.php ccxt#2138

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added a link to CC Power analytics article to examples/README.md

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add restored amountToString in cobinhood fix ccxt#2133

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missing semicolon typo fix in zaif

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kuna has['withdraw'] = false fix ccxt#2152

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added support for limit to fetchOrders, fethcOpenOrders, fetchClosedO…

…rders in qryptos

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implemented withdraw

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restored amountToString in cobinhood ccxt#2133

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updated the Manual slightly on the minFundingAddressLength ccxt#2145

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enabled order caching in kucoin to fix ccxt#2112

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