Add XmlPath2 / RegEx matchers

Solves issue #5

src/WireMock/Matchers/IMatcher.cs

@@ -0,0 +1,17 @@
+namespace WireMock.Matchers
+{
+    /// <summary>
+    /// IMatcher
+    /// </summary>
+    public interface IMatcher
+    {
+        /// <summary>
+        /// Determines whether the specified input is match.
+        /// </summary>
+        /// <param name="input">The input.</param>
+        /// <returns>
+        ///   <c>true</c> if the specified input is match; otherwise, <c>false</c>.
+        /// </returns>
+        bool IsMatch(string input);
+    }
+}