Make library portable

[ApocalypticOctopus]

It would be nice if the NuGet package was a portable class library. This could be done by using the template called Class Library (Portable) in Visual Studio 2015 Community Edition.

The advantage to doing it this way is that your library can be used in applications for Windows Store, Windows Phone, Xamarin Android, Xamarin iOS, Silverlight, etc.

[jgrosso]

Want to make a PR for review?

[ApocalypticOctopus]

Yes, that would be great!

[jgrosso]

We'll be watching... good luck!

[ApocalypticOctopus]

Thanks!

Unfortunately the IsAssignableFrom method is not available for .NET 4.5 (or 4.5.1) Portable Class Libraries.

To make CSharpMonad be a portable class library, we'll have to upgrade it to .NET 4.6 and a minimum of Visual Studio 2015. The advantage is that this library will be available for all Windows Universal 10 apps (which includes all the platforms listed here); the disadvantage is that the library wouldn't be available to code using less than .NET 4.6.

What do you think--is this tradeoff acceptable?