Introduced docGroupRef & added VC reference in collection query.

Change-Id: I4eb6f99279594ab825a3b1ebed9dedb076feb72b
diff --git a/pom.xml b/pom.xml
index 7cffd74..4661e94 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
 
 	<groupId>de.ids_mannheim.korap</groupId>
 	<artifactId>Koral</artifactId>
-	<version>0.29</version>
+	<version>0.30</version>
 	<packaging>jar</packaging>
 	<name>Koral</name>
 	<url>http://maven.apache.org</url>