Cleaned up environment detection

src/NzbDrone.Common/Http/UserAgentBuilder.cs

@@ -0,0 +1,17 @@
+using System;
+using NzbDrone.Common.EnvironmentInfo;
+
+namespace NzbDrone.Common.Http
+{
+    public static class UserAgentBuilder
+    {
+        public static string UserAgent { get; private set; }
+
+        static UserAgentBuilder()
+        {
+            UserAgent = String.Format("Sonarr/{0} ({1} {2}) ",
+                BuildInfo.Version,
+                OsInfo.Os, OsInfo.Version.ToString(2));
+        }
+    }
+}