Add Importer property to Meta response model

Implement unit test for GetMetadata() call
Flesh out integration test to check all returned Meta fields
-> Found and fixed a bug where the existing `GitHubServicesSHA` field was not deserialised properly

Octokit.Tests.Integration/Clients/MiscellaneousClientTests.cs

@@ -113,6 +113,11 @@ public class MiscellaneousClientTests
             var result = await github.Miscellaneous.GetMetadata();
 
             Assert.True(result.VerifiablePasswordAuthentication);
+            Assert.NotEmpty(result.GitHubServicesSha);
+            Assert.True(result.Hooks.Count > 0);
+            Assert.True(result.Git.Count > 0);
+            Assert.True(result.Pages.Count > 0);
+            Assert.True(result.Importer.Count > 0);
         }
     }
 }

Octokit.Tests/Clients/MiscellaneousClientTests.cs

@@ -136,6 +136,42 @@ namespace Octokit.Tests.Clients
             }
         }
 
+        public class TheGetMetadataMethod
+        {
+            [Fact]
+            public async Task RequestsTheMetadataEndpoint()
+            {
+                IApiResponse<Meta> response = new ApiResponse<Meta>
+                (
+                    new Response(),
+                    new Meta(
+                        false,
+                        "12345ABCDE",
+                        new[] { "1.1.1.1/24", "1.1.1.2/24" },
+                        new[] { "1.1.2.1/24", "1.1.2.2/24" },
+                        new[] { "1.1.3.1/24", "1.1.3.2/24" },
+                        new[] { "1.1.4.1", "1.1.4.2" }
+                    )
+                );
+                var connection = Substitute.For<IConnection>();
+                connection.Get<Meta>(Args.Uri, null, null)
+                    .Returns(Task.FromResult(response));
+                var client = new MiscellaneousClient(connection);
+
+                var result = await client.GetMetadata();
+
+                Assert.Equal(result.VerifiablePasswordAuthentication, false);
+                Assert.Equal(result.GitHubServicesSha, "12345ABCDE");
+                Assert.Equal(result.Hooks, new[] { "1.1.1.1/24", "1.1.1.2/24" });
+                Assert.Equal(result.Git, new[] { "1.1.2.1/24", "1.1.2.2/24" });
+                Assert.Equal(result.Pages, new[] { "1.1.3.1/24", "1.1.3.2/24" });
+                Assert.Equal(result.Importer, new[] { "1.1.4.1", "1.1.4.2" });
+
+                connection.Received()
+                    .Get<Meta>(Arg.Is<Uri>(u => u.ToString() == "meta"), null, null);
+            }
+        }
+
         public class TheCtor
         {
             [Fact]

Octokit/Models/Response/Meta.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Globalization;
+using Octokit.Internal;
 
 namespace Octokit
 {
@@ -30,13 +31,15 @@ namespace Octokit
             string gitHubServicesSha,
             IReadOnlyList<string> hooks,
             IReadOnlyList<string> git,
-            IReadOnlyList<string> pages)
+            IReadOnlyList<string> pages,
+            IReadOnlyList<string> importer)
         {
             VerifiablePasswordAuthentication = verifiablePasswordAuthentication;
             GitHubServicesSha = gitHubServicesSha;
             Hooks = hooks;
             Git = git;
             Pages = pages;
+            Importer = importer;
         }
 
         /// <summary>
@@ -49,6 +52,7 @@ namespace Octokit
         /// <summary>
         /// The currently-deployed SHA of github-services.
         /// </summary>
+        [Parameter(Key = "github_services_sha")]
         public string GitHubServicesSha { get; private set; }
 
         /// <summary>
@@ -68,6 +72,11 @@ namespace Octokit
         /// </summary>
         public IReadOnlyList<string> Pages { get; private set; }
 
+        /// <summary>
+        /// An Array of IP addresses specifying the addresses that source imports will originate from on GitHub.com.
+        /// </summary>
+        public IReadOnlyList<string> Importer { get; private set; }
+
         internal string DebuggerDisplay
         {
             get