Initial Notification Updates and Support (#401)

* Bare bones of notifications working.

* Add MovieDownload event handler

To allow Download notificaitons

* Update pushover text to indicate movie

* Initial Notification Support

On Download and On Grab notifications should work.

* Telegram Notification Text

* Update Custom Script For Movies

* Update PP script WiKi page

Also added wiki page to Radarr wiki.

src/NzbDrone.Core/Notifications/GrabMessage.cs

@@ -8,6 +8,8 @@ namespace NzbDrone.Core.Notifications
     {
         public string Message { get; set; }
         public Series Series { get; set; }
+        public Movie Movie { get; set; }
+        public RemoteMovie RemoteMovie { get; set; }
         public RemoteEpisode Episode { get; set; }
         public QualityModel Quality { get; set; }