dp770

Live Orders subscription support @ Bitstamp

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Added support of Live Orders subscription @ Bitstamp exchange

Issue #561: [HitBTC] OrderBook is missing support of timestamp

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Timestamp attribute is added to HitbtcOrderBookWithTimestamp (extension of HitbtcOrderBook)

Documentation: https://api.hitbtc.com/#order-book Stream URL: https://api.hitbtc.com/api/2/public/orderbook/ETHBTC Example message: `{ "ask": [ { "size": "0.088", "price": "0.046002" }, { "size": "0.200", "price": "0.046800" } ], "bid": [ { "size": "0.005", "price": "0.046001"...