Add support for crytocurrencies (Bittrex) about trady HOT 4 CLOSED

Bittrex has a public API endpoint to get their candles e.g:

https://bittrex.com/Api/v2.0/pub/market/GetTicks?marketName=BTC-NEO&tickInterval=fiveMin

Tickinterval has valid values of:

• Hour
• Day
• fiveMin
• oneMin
• thirtyMin

Haven't found one for 15 minutes yet though. Also haven't found a way to limit the amount of candles coming in yet.

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@Mike-EEE the importer is designed to import one ticker for each call as a unit of computation, but i agree that sometimes it's better to return multiple tickers if the provider supports it. It may also benefit importing from csv that contains multiple tickers 😄

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Cooooool... thanks @sthewissen that is good to know. I didn't even know there was a 2.0 version available as the API that they discuss on their site is 1.1.

I guess the next question I have is what is the typical strategy for importing multiple tickers? In my case I am wanting to perform calculations on the top 10-20% (maybe more) of coins by volume on Bittrex. Is it accepted/expected practice to simply cycle through those coins every minute and capture the latest candles for each coin? Seems pretty intensive. Would be nice to pass in multiple tickers and get them all in one pass.

One thought I just had was maybe go through and cycle through all coins once for seeding, then call the marketsummaries every minute to update. I could then use the CSV importer to pull in my data, and simply use what's there now without having to add any new importers. Hey, I think I just solved my own problem. 😆

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Merged with #21

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