Support running WireMock.Net as a sub-app in IIS (#164) (#158)

* Update examples (#158)

* IIS debug

* PathBase logic

* 1.0.4.5-preview-01

* Fix project and readme

* Fix issues

* fix picture alignment

* Add IIS publish examples

* 1.0.4.5

src/WireMock.Net/Util/UrlUtils.cs

@@ -0,0 +1,38 @@
+using System;
+using JetBrains.Annotations;
+using WireMock.Models;
+#if !NETSTANDARD
+using Microsoft.Owin;
+#else
+using Microsoft.AspNetCore.Http;
+#endif
+
+namespace WireMock.Util
+{
+    internal static class UrlUtils
+    {
+        public static UrlDetails Parse([NotNull] Uri uri, PathString pathBase)
+        {
+            if (!pathBase.HasValue)
+            {
+                return new UrlDetails(uri, uri);
+            }
+
+            var builder = new UriBuilder(uri);
+            builder.Path = RemoveFirst(builder.Path, pathBase.Value);
+
+            return new UrlDetails(uri, builder.Uri);
+        }
+
+        private static string RemoveFirst(string text, string search)
+        {
+            int pos = text.IndexOf(search);
+            if (pos < 0)
+            {
+                return text;
+            }
+
+            return text.Substring(0, pos) + text.Substring(pos + search.Length);
+        }
+    }
+}