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);
+        }
+    }
+}

Filtration.Tests/Services/TestUpdateService.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Filtration.Models;
+using Filtration.Services;
+using Moq;
+using NUnit.Framework;
+
+namespace Filtration.Tests.Services
+{
+    [TestFixture]
+    public class TestUpdateService
+    {
+        [Test]
+        public void DeserializeUpdateData_ReturnsCorrectData()
+        {
+            // Arrange
+            var testInputData = @"<UpdateData>
+	                                <CurrentVersion>0.2</CurrentVersion>
+	                                <ReleaseDate>2015-07-01</ReleaseDate>
+                                    <DownloadUrl>http://www.google.com</DownloadUrl>
+	                                <ReleaseNotes>* Release notes line 1
+* Release notes line 2
+* More really great release notes!</ReleaseNotes>
+                                </UpdateData>";
+
+            var expectedResult = new UpdateData
+            {
+                CurrentVersion = 0.2m,
+                DownloadUrl = "http://www.google.com",
+                ReleaseDate = new DateTime(2015, 7, 1),
+                ReleaseNotes = @"* Release notes line 1
+* Release notes line 2
+* More really great release notes!"
+            };
+
+            var mockHTTPService = new Mock<IHTTPService>();
+            var service = new UpdateCheckService(mockHTTPService.Object);
+
+            // Act
+            var result = service.DeserializeUpdateData(testInputData);
+
+            // Assert
+            Assert.AreEqual(expectedResult.CurrentVersion, result.CurrentVersion);
+            Assert.AreEqual(expectedResult.DownloadUrl, result.DownloadUrl);
+            Assert.AreEqual(expectedResult.ReleaseDate, result.ReleaseDate);
+            Assert.AreEqual(expectedResult.ReleaseNotes, result.ReleaseNotes);
+        }
+
+    }
+}