set parent version to 24 and add empty relativePath where missing

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1689593 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index b358b77..118a172 100755
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,8 @@
     <parent>
         <groupId>org.apache.sling</groupId>
         <artifactId>sling</artifactId>
-        <version>23</version>
+        <version>24</version>
+        <relativePath/>
     </parent>
         
     <artifactId>org.apache.sling.javax.activation</artifactId>