Finally removed legacy collection classes

Change-Id: I05948702b76d14a9024cefa3c7c5882e00cb718a
diff --git a/Changes b/Changes
index fe5d4f3..f6b5eb9 100644
--- a/Changes
+++ b/Changes
@@ -1,4 +1,4 @@
-0.53 2015-07-31
+0.53 2015-08-04
         - [feature] Implemented new KrillCollection (diewald)
 	  This should fix a lot of issues with deleted
 	  documents and negation in virtual collections.