prepare the 2.3.1 release

Author: bodewig

RELEASE_NOTES.md

@@ -1,6 +1,10 @@
 # Release Notes
 
-## XMLUnit.NET 2.3.1 - /Not Released, yet/
+## XMLUnit.NET 2.3.1 - /Released 2017-03-23/
+
+* provided xml doc files for the release version and inside the nuget
+  package.
+  [user-guide/#11](https://github.com/xmlunit/user-guide/issues/11)
 
 ## XMLUnit.NET 2.3.0 - /Released 2016-11-12/
 

src/doc/monodoc/core/index.xml

@@ -45,5 +45,5 @@
       under <format type="text/html"><a href="https://github.com/xmlunit/xmlunit.net/blob/master/LICENSE">the
       Apache License, Version 2.0</a></format>.</para></Remarks>
   <Copyright></Copyright>
-  <Title>XMLUnit.NET 2.3.1-alpha-01</Title>
+  <Title>XMLUnit.NET 2.3.1</Title>
 </Overview>

src/shared/CommonAssemblyInfo.cs

@@ -26,7 +26,7 @@ namespace Org.XmlUnit
     internal static class XmlUnitVersion
     {
         internal const string ApiVersion = "2.3.1";
-        internal const string AssemblyVersion = ApiVersion + ".96";
-        internal const string Version = ApiVersion + "-alpha-01";
+        internal const string AssemblyVersion = ApiVersion + ".100";
+        internal const string Version = ApiVersion + "";
     } 
 }