More cleanup, namespace fixes, convenience methods for IKernel

src/NadekoBot.Tests/BotStringsTests.cs

@@ -6,7 +6,6 @@ using Discord.Commands;
 using NadekoBot.Common;
 using NadekoBot.Common.Attributes;
 using NadekoBot.Services;
-using NadekoBot.Modules;
 
 namespace NadekoBot.Tests
 {

src/NadekoBot.Tests/GroupGreetTests.cs

@@ -1,7 +1,6 @@
 using System.Linq;
 using System.Threading.Tasks;
 using Nadeko.Common;
-using NadekoBot.Extensions;
 using NadekoBot.Services;
 using NUnit.Framework;
 

src/NadekoBot.Tests/KwumTests.cs

@@ -1,5 +1,4 @@
 using Nadeko.Common;
-using NadekoBot.Common;
 using NUnit.Framework;
 
 namespace NadekoBot.Tests

src/NadekoBot.Tests/PubSubTests.cs

@@ -1,6 +1,5 @@
 using System.Threading.Tasks;
 using Nadeko.Common;
-using NadekoBot.Common;
 using NUnit.Framework;
 using NUnit.Framework.Internal;