Continuous builds

We use AppVeyor to build Gemini after every commit to the master branch, and also to generate pre-release NuGet packages so you can try out new features immediately.

To access the pre-release NuGet packages, you'll need to add a custom package source in Visual Studio, pointing to this URL:

https://ci.appveyor.com/nuget/gemini-g84phgw340sm

Make sure you select "Include Prerelease" when searching for NuGet packages.