The average Bitcoin price in USD is retrieved from the blockchain api and stored in a Price record.
Add basic structure to support bitcoin average as provider. Not finished yet.
Add support the following providers: blockhain, bitcoin average. Getting the current BTC price average usign the two supported providers.
Refactor exchanges api by meerkat api.
Merge pull request #3 from julianespinel/feature-support-blockchain-and-bitcoin-average-as-providers

Feature support blockchain and bitcoin average as providers