Rename to Octokit to be consistent with other API libs

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

Octokit/Http/Request.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+
+namespace Octokit.Http
+{
+    public class Request : IRequest
+    {
+        public Request()
+        {
+            Headers = new Dictionary<string, string>();
+            Parameters = new Dictionary<string, string>();
+        }
+
+        public object Body { get; set; }
+        public Dictionary<string, string> Headers { get; private set; }
+        public HttpMethod Method { get; set; }
+        public Dictionary<string, string> Parameters { get; private set; }
+        public Uri BaseAddress { get; set; }
+        public Uri Endpoint { get; set; }
+    }
+}