seal up unsealed classes, clean up using statements

src/Untappd.Net.UnitTests/Request/TestRepository.cs

@@ -1,15 +1,14 @@
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.IO;
 using System.Threading.Tasks;
 using Moq;
-using Newtonsoft.Json;
 using NUnit.Framework;
 using RestSharp;
-using Untappd.Net.Request;
-using Untappd.Net.Responses.BeerInfo;
-using Untappd.Net.Responses.Actions;
-using System.IO;
 using Untappd.Net.Authentication;
+using Untappd.Net.Request;
+using Untappd.Net.Responses.Actions;
+using Untappd.Net.Responses.BeerInfo;
 
 namespace Untappd.Net.UnitTests.Request
 {

src/Untappd.Net.UnitTests/Responses/Actions/TestCheckInAction.cs

@@ -1,8 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using NUnit.Framework;
 using Untappd.Net.Responses.Actions;
 

src/Untappd.Net.UnitTests/Responses/Actions/TestSimpleActions.cs

@@ -1,8 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using NUnit.Framework;
 using Untappd.Net.Responses.Actions;
 

src/Untappd.Net/Authentication/AuthenticatedUntappdCredentials.cs

@@ -4,7 +4,7 @@ using System.Collections.ObjectModel;
 
 namespace Untappd.Net.Authentication
 {
-    public class AuthenticatedUntappdCredentials : UntappdCredentials, IAuthenticatedUntappdCredentials
+    public sealed class AuthenticatedUntappdCredentials : UntappdCredentials, IAuthenticatedUntappdCredentials
     {
         /// <summary>
         /// Pass your authenticated access token

src/Untappd.Net/Authentication/UnAuthenticatedUntappdCredentials.cs

@@ -4,7 +4,7 @@ using System.Collections.ObjectModel;
 
 namespace Untappd.Net.Authentication
 {
-    public class UnAuthenticatedUntappdCredentials : UntappdCredentials, IUnAuthenticatedUntappdCredentials
+    public sealed class UnAuthenticatedUntappdCredentials : UntappdCredentials, IUnAuthenticatedUntappdCredentials
     {
         /// <summary>
         /// UnAuthenticated request. Pass your API id and secret

src/Untappd.Net/Exception/EndpointConfigurationException.cs

@@ -3,7 +3,7 @@
 namespace Untappd.Net.Exception
 {
     [Serializable]
-    public class EndpointConfigurationException : BaseUntappdException
+    public sealed class EndpointConfigurationException : BaseUntappdException
     {
         /// <summary>
         /// Called when a class has an empty endpoint

src/Untappd.Net/Exception/HttpErrorException.cs

@@ -1,9 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using Newtonsoft.Json;
 using RestSharp;
 

src/Untappd.Net/Request/Repository.cs

@@ -1,16 +1,15 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Net;
 using System.Threading.Tasks;
 using Newtonsoft.Json;
-using Newtonsoft.Json.Linq;
 using RestSharp;
-using Untappd.Net.Exception;
-using System;
 using Untappd.Net.Authentication;
+using Untappd.Net.Exception;
 
 namespace Untappd.Net.Request
 {
-    public partial class Repository
+    public sealed partial class Repository
     {
         internal IRestClient Client;
         internal IRestRequest Request;

src/Untappd.Net/Request/RepositoryGet.cs

@@ -5,7 +5,7 @@ using Untappd.Net.Exception;
 
 namespace Untappd.Net.Request
 {
-    public partial class Repository
+    public sealed partial class Repository
     {
         /// <summary>
         /// Get the things!

src/Untappd.Net/Request/RepositoryPost.cs

@@ -3,7 +3,7 @@ using Untappd.Net.Authentication;
 
 namespace Untappd.Net.Request
 {
-    public partial class Repository
+    public sealed partial class Repository
     {
         /// <summary>
         /// do a post with actions

src/Untappd.Net/Responses/Actions/RemoveFromWishList.cs

@@ -1,8 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
+using System.Collections.Generic;
 using RestSharp;
 using Untappd.Net.Request;
 

src/Untappd.Net/SingleObjectArrayConverter.cs

@@ -10,7 +10,7 @@ namespace Untappd.Net
     /// Deserialize json as T if json schema defines an object.
     /// </summary>
     /// <typeparam name="T"></typeparam>
-    internal class SingleObjectArrayConverter<T> : JsonConverter
+    internal sealed class SingleObjectArrayConverter<T> : JsonConverter
         where T : new()
     {
         public override bool CanConvert(Type objectType)