Add artifactId, currently showing null with maven jar:install.

project.xml

@@ -20,6 +20,7 @@
 -->
 <project>
   <pomVersion>3</pomVersion>
+  <artifactId>acegisecurity</artifactId>
   <groupId>acegisecurity</groupId>
   <currentVersion>0.8.2-SNAPSHOT</currentVersion>
   <package>net.sf.acegisecurity</package>