Test MVC ViewEngine with lower MVC versions and consider downgrade of requirements #201
Description
The MVC ViewEngine currently requires a specific version of the ASP.NET MVC5 framework. However, we probably don't require absolutely that version, we could probably handle any version of 5.x.x.
If we don't need that latest version then the requirements may be relaxed, and then we could permit users to use older versions of MVC5 and still be compatible.
In this ticket we need to test the ViewEngine with lower versions of MVC5 and - if successful - downgrade the requirements in the NuGet package to the actual minimum required version.