Create observable commits client

Octokit.Reactive/Clients/ObservableCommitsClient.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Reactive.Threading.Tasks;
+
+namespace Octokit.Reactive
+{
+    public class ObservableCommitsClient : IObservableCommitsClient
+    {
+        readonly ICommitsClient _client;
+
+        public ObservableCommitsClient(IGitHubClient client)
+        {
+            Ensure.ArgumentNotNull(client, "client");
+            _client = client.GitDatabase.Commit;
+        }
+
+        public IObservable<Commit> Get(string owner, string name, string reference)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
+            Ensure.ArgumentNotNullOrEmptyString(name, "name");
+            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");
+
+            return _client.Get(owner, name, reference).ToObservable();            
+        }
+    }
+}