Moved extension classes to seperate files as Jimmacle requires.

Torch.API/Managers/DependencyProviderExtensions.cs

@@ -0,0 +1,15 @@
+namespace Torch.API.Managers
+{
+    public static class DependencyProviderExtensions
+    {
+        /// <summary>
+        /// Gets the manager that provides the given type.  If there is no such manager, returns null.
+        /// </summary>
+        /// <typeparam name="T">Type of manager</typeparam>
+        /// <returns>manager, or null if none exists</returns>
+        public static T GetManager<T>(this IDependencyProvider depProvider) where T : class, IManager
+        {
+            return (T)depProvider.GetManager(typeof(T));
+        }
+    }
+}