Squash some warnings (#278)

* squash SA1649 warnings (file/type name mismatch)

* squash SA1127 warnings (generic constraint on own line)

* squash SA1507 warnings (multiple blank lines)

* squash package analysis warnings re: summary text

It's not actually possible to provide a summary right now as per
https://github.com/NuGet/Home/issues/4587

* squash missing castle.core reference warning

* squash obsolete method warnings re: AddOcelotBaseUrl

test/Ocelot.UnitTests/DependencyInjection/ConfigurationBuilderExtensionsTests.cs

@@ -22,9 +22,10 @@ namespace Ocelot.UnitTests.DependencyInjection
 
         private void GivenTheBaseUrl(string baseUrl)
         {
+            #pragma warning disable CS0618
             var builder = new ConfigurationBuilder()
                 .AddOcelotBaseUrl(baseUrl);
-
+            #pragma warning restore CS0618
             _configuration = builder.Build();
         }