add version line in theming document

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1125 44740490-163a-0410-bde0-09ae8108e29a

docs/source/simplesamlphp-theming.txt

@@ -7,6 +7,9 @@ Theming the user interface in SimpleSAMLphp
 	http://daringfireball.net/projects/markdown/syntax
 -->
 
+  * Version: `$Id$`
+
+
 In SimpleSAMLphp every part that needs to interact with the user by using a web page, uses templates to present the XHTML. SimpleSAMLphp comes with a default set of templates that presents a anonymous look.
 
 You may create your own theme, where you add one or more template files that will override the default ones. This document explains how to achieve that.