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

Change-Id: Ie5cd0cea3b651eb93c5b46e669cc9cd37503c8b3
diff --git a/Changes b/Changes
index b1c4a45..862b218 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,10 @@
+0.53 2015-07-24
+        - [feature] Implemented new KrillCollection (diewald)
+	  This should fix a lot of issues with deleted
+	  documents and negation in virtual collections.
+	- [cleanup] REMOVED deprecated collection filtering (diewald)
+	- [feature] Added removal methods for documents (diewald)
+
 0.52 2015-07-08
         - [bugfix] Fixed payload filtering in FocusSpans (margaretha)
 	- [workaround] Reintroduced empty collection support,