Continues refactoring tests, added overload for UpdateOne and UpdateOneAsync so that we can pass a LINQ query to the method.

IntegrationTests/CRUDTests.cs

@@ -0,0 +1,18 @@
+using IntegrationTests.Infrastructure;
+using NUnit.Framework;
+
+namespace IntegrationTests
+{
+    public class TestDocument : TestDoc
+    {
+    }
+
+    [TestFixture]
+    public class CRUDTests : MongoDbDocumentTestBase<TestDocument>
+    {
+        public override string GetClassName()
+        {
+            return "CRUDTests";
+        }
+    }
+}