Added mono detection for provided types

src/Xamarin.iOSProviders/ProvidedTypes.fs

@@ -26,6 +26,7 @@ type internal ExpectedStackState =
 
 [<AutoOpen>]
 module internal Misc =
+    let runningOnMono = try System.Type.GetType("Mono.Runtime") <> null with e -> false 
     let TypeBuilderInstantiationType = 
         if runningOnMono
         then typeof<TypeBuilder>.Assembly.GetType("System.Reflection.MonoGenericClass")

src/Xamarin.iOSProviders/iOSDesignerProvider.fs

@@ -229,7 +229,7 @@ type iOSDesignerProvider(config: TypeProviderConfig) as this =
         viewControllerType
 
     do  rootType.DefineStaticParameters([ProvidedStaticParameter("DesignerFile", typeof<string>)], buildTypes) 
-    do this.AddNamespace(ns, [rootType])
+        this.AddNamespace(ns, [rootType])
 
     interface IDisposable with
         member x.Dispose() =