Feature/re route specific handlers (#269)

* #264 added handlers to config

* #264 added global handlers object and defaut param for method, not sure this is correct api for users yet

* #264 Can now add all sorts of delegating handlers in all sorts of ways

* +semver: breaking #264

test/Ocelot.AcceptanceTests/GzipTests.cs

@@ -107,6 +107,7 @@ namespace Ocelot.AcceptanceTests
 
             _builder.Start();
         }
+
         public void Dispose()
         {
             _builder?.Dispose();