Moved over assert extension method.
Renamed a spy to a stub.
Added CitiFileImportInteractor
Citi File Import now uses the interactor.
Console now uses an interface for the interactor.
No real change.
No real change.
Merge branch 'master' into StandardDeviation

Conflicts:
	src/UnitTests/Core/MonthlyReturnSeriesForCalculateReturnTests.cs
	src/UnitTests/Core/ReturnResultTestExtensions.cs