Test SSI with PHP

Change-Id: I53a0cfcce0d7b49170d6f4870fd4cfcf7317259f
diff --git a/documentation/samples/1st.html b/documentation/samples/1st.php
similarity index 98%
rename from documentation/samples/1st.html
rename to documentation/samples/1st.php
index 10729bd..d3d1020 100644
--- a/documentation/samples/1st.html
+++ b/documentation/samples/1st.php
@@ -24,7 +24,8 @@
 
 
   <body>
-<!--#include virtual="/tea/header.html"  -->
+<?php include '/tea/header.php'; ?>
+
 <img style="position: fixed; top: 0; right: 0; margin-top: 65px; z-index:1000; border: 0; " src="/tea/images/incubation.png"/>
 
 <div id="page">
diff --git a/header.html b/header.php
similarity index 100%
rename from header.html
rename to header.php