Added UserAgent to RestClient.

src/NzbDrone.Core/Rest/RestClientFactory.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using RestSharp;
+using NzbDrone.Common.EnvironmentInfo;
+
+namespace NzbDrone.Core.Rest
+{
+    public static class RestClientFactory
+    {
+        public static RestClient BuildClient(String baseUrl)
+        {
+            var restClient = new RestClient(baseUrl);
+
+            restClient.UserAgent = String.Format("NzbDrone/{0} (RestSharp/{1}; {2}/{3})",
+                BuildInfo.Version,
+                restClient.GetType().Assembly.GetName().Version,
+                OsInfo.Os, OsInfo.Version.ToString(2));
+
+            return restClient;
+        }
+    }
+}