Move one more unit test to MockFileSystem
One more unit test moved to MockFileSystem
Remove aborted attempt at including images in living documentation.
Upgrade System.IO.Abstraction
Open StreamReader using the fileSystem from System.IO.Abstractions
Update System.IO.Abstractions, move files and make them resources/do not copy
Make all tests work with System.IO.Abstractions.TestHelpers
Remove redundant RealFileSystem
Rename MockFileSystem to FileSystem