Rename to Octokit to be consistent with other API libs

GitHub is naming all of the libraries Octokit for their respective
platforms

Octokit.Reactive/ObservableGitHubClient.cs

@@ -0,0 +1,26 @@
+using Octokit.Reactive.Clients;
+
+namespace Octokit.Reactive
+{
+    public class ObservableGitHubClient : IObservableGitHubClient
+    {
+        public ObservableGitHubClient(IGitHubClient gitHubClient)
+        {
+            Ensure.ArgumentNotNull(gitHubClient, "githubClient");
+            
+            Authorization = new ObservableAuthorizationsClient(gitHubClient.Authorization);
+            AutoComplete = new ObservableAutoCompleteClient(gitHubClient.AutoComplete);
+            Organization = new ObservableOrganizationsClient(gitHubClient.Organization);
+            Repositories = new ObservableRepositoriesClient(gitHubClient.Repository);
+            SshKey = new ObservableSshKeysClient(gitHubClient.SshKey);
+            User = new ObservableUsersClient(gitHubClient.User);
+        }
+
+        public IObservableAuthorizationsClient Authorization { get; private set; }
+        public IObservableAutoCompleteClient AutoComplete { get; private set; }
+        public IObservableOrganizationsClient Organization { get; private set; }
+        public IObservableRepositoriesClient Repositories { get; private set; }
+        public IObservableSshKeysClient SshKey { get; private set; }
+        public IObservableUsersClient User { get; private set; }
+    }
+}