Added auto updater

Filtration.Tests/Services/TestHTTPService.cs

@@ -0,0 +1,23 @@
+using Filtration.Services;
+using NUnit.Framework;
+
+namespace Filtration.Tests.Services
+{
+    [Ignore("Integration Test - Makes real HTTP call")]
+    [TestFixture]
+    public class TestHTTPService
+    {
+        [Test]
+        public async void GetContent_FetchesDataFromUrl()
+        {
+            // Arrange
+            var service = new HTTPService();
+
+            // Act
+            var result = await service.GetContentAsync("http://ben-wallis.github.io/Filtration/filtration_version.xml");
+
+            // Assert
+            Assert.IsNotNull(result);
+        }
+    }
+}