New: Add Webhook support to sonarr

Add Form type url (type=url input field)
Add isValidUrl input type validation

Only allow absolute urls when checking if a url is valid

String => string as per comments that sonarr is standarizing on the lowercase primative

Remove this before function calls

Refactored everything so OnGrab is supported

Don't double submit the webhook

Wrappers around Series, EpisodeFile, Episode so the entire data structure isn't exposed

Add Braces as per style guide

Series.ID and Series.TvdbId should be integers

Reorder webhook payload as per style guide

Upgrade to use ongrab as json instead of string

Add method selection to webhook settings

include episode directly in download event

QualityVersion should be an int and not a string (don't convert it int=>string)

Remove the list of episodes

Add season number to episode data structure

Code Review Fixes:

* Remove episodefile from payload, move everything to episode
* Change episode to a list

convert to var as per code review / style guide

Down with internals

Everything now uses webhookpayload. None of that payload.Message stuff

{"EventType":"Test","Series":{"Id":1,"Title":"Test Title","Path":"C:\\testpath","TvdbId":1234},"Episodes":[{"Id":123,"EpisodeNumber":1,"SeasonNumber":1,"Title":"Test title","AirDate":null,"AirDateUtc":null,"Quality":null,"QualityVersion":0,"ReleaseGroup":null,"SceneName":null}]}

Remove logger and processProvider

Remove unused constructor

src/NzbDrone.Core/Notifications/Webhook/Webhook.cs

@@ -0,0 +1,55 @@
+
+using System.Collections.Generic;
+using FluentValidation.Results;
+using NzbDrone.Core.Tv;
+using NzbDrone.Common.Extensions;
+
+namespace NzbDrone.Core.Notifications.Webhook
+{
+    public class Webhook : NotificationBase<WebhookSettings>
+    {
+        private readonly IWebhookService _service;
+
+        public Webhook(IWebhookService service)
+        {
+            _service = service;
+        }
+
+        public override string Link
+        {
+            get { return "https://github.com/Sonarr/Sonarr/wiki/Webhook"; }
+        }
+
+        public override void OnGrab(GrabMessage message)
+        {
+            _service.OnGrab(message.Series, message.Episode, message.Quality, Settings);
+        }
+
+        public override void OnDownload(DownloadMessage message)
+        {
+            _service.OnDownload(message.Series, message.EpisodeFile, Settings);
+        }
+
+        public override void OnRename(Series series)
+        {
+            _service.OnRename(series, Settings);
+        }
+
+        public override string Name
+        {
+            get
+            {
+                return "Webhook";
+            }
+        }
+
+        public override ValidationResult Test()
+        {
+            var failures = new List<ValidationFailure>();
+
+            failures.AddIfNotNull(_service.Test(Settings));
+
+            return new ValidationResult(failures);
+        }
+    }
+}