bter/gateio: metainfo

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added const, let and var to transpile.js

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proper currency code for BCH on binance (BCC) fix ccxt#1161

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quadrigacx typo btc_cad → bch_cad fix ccxt#1157

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added instructions to copy package.json to python folder for npm

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added handleErrors to poloniex

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simple gateio UTC+8 datetimes workaround fix ccxt#1155

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travis retrigger

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tests: typos fixes for ccxt#1141

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bl3p: fetchTrades: trade.is is now String

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