The later versions of the Microsoft.AspNet.WebPages NuGet package only support .NET 4.5
The older version 2.0.30506.0 supports .NET 4.0
To figure this out I used the NuGet Package Explorer, displayed the list of package versions and opened a few of the NuGet packages to see what .NET frameworks they support. As far as I am aware you cannot get the supported .NET frameworks from the metadata returned by the nuget.org OData feed. The only way I know is to look inside the NuGet package itself.