v2.1.0.183

• Increased support for Unix
• MockFile should now throw a DirectoryNotFoundException if the directory that the file resides in does not exist
• Update pathing to support the new System.IO.Abstractions organization

Upgrade to .NET 4.0

Supports newer signatures from .NET 4.0, but also require .NET 4.0

If you need .NET 3.5 support, stick to the 1.x.x.x line.