Merge pull request #1105 from ploughpuff/ratelimit

Only delay making MusicBrainz request if necessary

MediaBrowser.Common/IApplicationHost.cs

@@ -71,6 +71,12 @@ namespace MediaBrowser.Common
         /// <value>The application user agent.</value>
         string ApplicationUserAgent { get; }
 
+        /// <summary>
+        /// Gets the email address for use within a comment section of a user agent field.
+        /// Presently used to provide contact information to MusicBrainz service.
+        /// </summary>
+        string ApplicationUserAgentAddress { get; }
+
         /// <summary>
         /// Gets the exports.
         /// </summary>