Removed unused using statements

src/NzbDrone.Core/Indexers/Rarbg/RarbgParser.cs

@@ -1,8 +1,6 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Net;
 using System.Text.RegularExpressions;
-using Newtonsoft.Json.Linq;
 using NzbDrone.Common.Http;
 using NzbDrone.Core.Indexers.Exceptions;
 using NzbDrone.Core.Parser.Model;

src/NzbDrone.Core/Indexers/Rarbg/RarbgRequestGenerator.cs

@@ -1,5 +1,4 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using NzbDrone.Common.Extensions;
 using NzbDrone.Common.Http;
 using NzbDrone.Core.IndexerSearch.Definitions;

src/NzbDrone.Core/Indexers/Rarbg/RarbgSettings.cs

@@ -1,4 +1,3 @@
-using System;
 using FluentValidation;
 using NzbDrone.Core.Annotations;
 using NzbDrone.Core.ThingiProvider;