Adding wagon extension to pom file

The maven on ubuntu is built without wagon support,
see:
http://spring-java-ee.blogspot.com/2010/03/solving-maven-deployrelease-problem.html

Change-Id: I7632b70528ab480887f54bc7047c5ca77e0627d3

pom.xml

diff --git a/pom.xml b/pom.xml
index 345eda2..5f1a752 100644
--- a/pom.xml
+++ b/pom.xml
@@ -109,6 +109,14 @@
         </executions>
       </plugin>
     </plugins>
+
+    <extensions>
+        <extension>
+            <groupId>org.apache.maven.wagon</groupId>
+            <artifactId>wagon-webdav-jackrabbit</artifactId>
+            <version>1.0-beta-6</version>
+        </extension>
+    </extensions>
   </build>
 
   <distributionManagement>