Improve price fetching

[asbjornenge]

• Fetch from different sources
• Live updates for all coins
• Price history that supports trending, for coins and baskets

[asbjornenge]

Ok, so what we need is a more stable coin, price and history fetching solution.

We want lots of coins available to follow...
We need 30 days of price data for every following coin (we allow 24h, 1w, 1m trend lines)...
We need a stable way to stream price data without getting out of sync...