docker files fixes from liaqat

src/Managing.Core/AsyncLazy.cs

@@ -0,0 +1,22 @@
+using System.Runtime.CompilerServices;
+
+namespace Managing.Core
+{
+    /// <summary>
+    /// http://blogs.msdn.com/b/pfxteam/archive/2011/01/15/asynclazy-lt-t-gt.aspx
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
+    public class AsyncLazy<T> : Lazy<Task<T>>
+    {
+        public AsyncLazy(Func<T> valueFactory) :
+            base(() => Task.Factory.StartNew(valueFactory))
+        { }
+
+        public AsyncLazy(Func<Task<T>> taskFactory) :
+            base(() => Task.Factory.StartNew(() => taskFactory()).Unwrap())
+        { }
+
+        public TaskAwaiter<T> GetAwaiter() { return Value.GetAwaiter(); }
+    }
+
+}