Add support to bind to ip-address instead of only localhost (#1100)

* Add support to bind to ip-address instead of only localhost

* .

* .

test/WireMock.Net.Tests/Http/HttpRequestMessageHelperTests.cs

@@ -1,9 +1,8 @@
-using NFluent;
 using System.Collections.Generic;
-using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using FluentAssertions;
+using NFluent;
 using WireMock.Http;
 using WireMock.Models;
 using WireMock.Types;