* Refactor chain providers
- ChainProviders will use quote, open interest and trade information,
which ever is first. Updating regression algorithm changing contract
being added.
- Add base BacktestingChainProvider for shared logic, reducing
duplication.
- ChainProviders will now use the given IDataCacheProvider and
IMapFileProvider
- If Providers are called for a date the exchange is closed they will
search for the previous available date where the exchange is open.
Adding unit tests.
* Address reviews. Logging improvements
Martin-Molinero