Make add-in debug work on Mac and Windows.
Make add-in debug work on Mac and Windows.

Changing order of locations to look for XS/MD

fsharp/xamarin-monodevelop-fsharp-addin,fsharp/fsharpbinding,nosami/xamarin-monodevelop-fsharp-addin,fsharp/fsharpbinding,nosami/xamarin-monodevelop-fsharp-addin,fsharp/fsharpbinding,Ming-Tang/fsharpbinding,Ming-Tang/fsharpbinding,Ming-Tang/fsharpbinding,fsharp/xamarin-monodevelop-fsharp-addin