RequestMessageParamMatcher supports Ignore Case for the key (#254)

* RequestMessageParamMatcher

* /o:

* 1.0.8

src/WireMock.Net/Admin/Mappings/ParamModel.cs

@@ -10,6 +10,11 @@
         /// </summary>
         public string Name { get; set; }
 
+        /// <summary>
+        /// Defines if the key should be matched using case-ignore.
+        /// </summary>
+        public bool? IgnoreCase { get; set; }
+
         /// <summary>
         /// Gets or sets the matchers.
         /// </summary>