Implemented the following changes to the API
* Added bestBidSize and bestAskSize to tickerBook and websocket ticker.
* Added bestBid, bestBidSize, bestAsk, bestAskSize and timestamp to ticker24h.
* Added tradeIdFrom/tradeIdTo and orderIdFrom/orderIdTo to limit returned trades/orders (deprecating tradeId/orderId in those searches).
* Added ticker24h websocket stream.