Merge ModelsBuilder in, NuGet dies on circ dependencies now

src/Umbraco.ModelsBuilder/TypeExtensions.cs

@@ -0,0 +1,22 @@
+using System;
+
+namespace Umbraco.ModelsBuilder
+{
+    internal static class TypeExtensions
+    {
+        /// <summary>
+        /// Creates a generic instance of a generic type with the proper actual type of an object.
+        /// </summary>
+        /// <param name="genericType">A generic type such as <c>Something{}</c></param>
+        /// <param name="typeParmObj">An object whose type is used as generic type param.</param>
+        /// <param name="ctorArgs">Arguments for the constructor.</param>
+        /// <returns>A generic instance of the generic type with the proper type.</returns>
+        /// <remarks>Usage... typeof (Something{}).CreateGenericInstance(object1, object2, object3) will return
+        /// a Something{Type1} if object1.GetType() is Type1.</remarks>
+        public static object CreateGenericInstance(this Type genericType, object typeParmObj, params object[] ctorArgs)
+        {
+            var type = genericType.MakeGenericType(typeParmObj.GetType());
+            return Activator.CreateInstance(type, ctorArgs);
+        }
+    }
+}