added version method.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@4093 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/Functions.java

@@ -598,6 +598,10 @@ public class Functions {
         return buf.toString();
     }
 
+    public static String getVersion() {
+        return Hudson.VERSION;
+    }
+
     // the switch to enable search feature
     public static boolean searchFeature = System.getProperty("search")!=null;
 }