Introduced new KrillCollection interface - but with a failing test for deleted documents

Change-Id: Ie5cd0cea3b651eb93c5b46e669cc9cd37503c8b3
diff --git a/pom.xml b/pom.xml
index e6d8a61..e0eb994 100644
--- a/pom.xml
+++ b/pom.xml
@@ -24,7 +24,7 @@
 
   <groupId>de.ids_mannheim.korap</groupId>
   <artifactId>Krill</artifactId>
-  <version>0.52</version>
+  <version>0.53</version>
   <packaging>jar</packaging>
 
   <name>Krill</name>