Added static constructor in From.cs in order to initialize services if used outside of the normal test flow (closes #267)

Author: ivaylokenov

src/MyTested.AspNetCore.Mvc.Abstractions/From.cs

@@ -1,12 +1,18 @@
 namespace MyTested.AspNetCore.Mvc
 {
+    using Internal.Application;
     using Internal.Services;
 
     /// <summary>
     /// Provides easy resolving of expression method argument values from the application <see cref="System.IServiceProvider"/>.
     /// </summary>
     public static class From
     {
+        static From()
+        {
+            TestApplication.TryInitialize();
+        }
+
         /// <summary>
         /// Indicates that a argument should be resolved from the application <see cref="System.IServiceProvider"/> in a method call lambda expression.
         /// </summary>