Add support for WithoutDefaultPort as WithPort doesn't allow "-1" to be sent to hide DefaultPorts

src/UriBuilder.Fluent.UnitTests/ExtensionTests.cs

@@ -78,6 +78,22 @@ namespace FluentUriBuilder.Tests
             Assert.Equal(url.Port, 22);
         }
 
+        [Fact]
+        public void WithoutDefaultPort()
+        {
+            var url = new UriBuilder("http://awesome.com:80")
+                .WithoutDefaultPort();
+            Assert.Equal("http://awesome.com", url.Uri.ToString());
+
+            url = new UriBuilder("http://awesome.com:443")
+                .WithoutDefaultPort();
+            Assert.Equal("http://awesome.com:443", url.Uri.ToString());
+
+            url = new UriBuilder("https://awesome.com:443")
+                .WithoutDefaultPort();
+            Assert.Equal("https://awesome.com", url.Uri.ToString());
+        }
+
         [Fact]
         public void WithHttps()
         {

src/UriBuilder.Fluent/TerribleDevUriExtensions.cs

@@ -81,6 +81,17 @@ namespace System
             return bld;
         }
 
+        /// <summary>
+        /// Removes the port number for default ports
+        /// </summary>
+        /// <param name="bld"></param>
+        /// <returns></returns>
+        public static UriBuilder WithoutDefaultPort(this UriBuilder bld)
+        {
+            if (bld.Uri.IsDefaultPort) bld.Port = -1;
+            return bld;
+        }
+
         /// <summary>
         /// appends a path segment to the path. Can be called multiple times to append multiple segments
         /// </summary>