- Reduce the amount of `Path.Combine()` usages -> it has a peformance
overhead
- Improving `FineFundamentalSubscriptionFactory` GetSource algorithm,
now it will not check if each file exists while finding the appropriate,
since we already iterated the directory before
- `DefaultDataProvider` will not check if file exists since `new
FileStream` performance the same operation internally
Martin Molinero
b6e9498b9e