Implemented confidential client deregistration task and added tests.

Change-Id: I78118166d0660b0816f6da496cead7d46b60b756
diff --git a/core/pom.xml b/core/pom.xml
index 9f94268..cc807bb 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -3,7 +3,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>de.ids_mannheim.korap</groupId>
 	<artifactId>Kustvakt-core</artifactId>
-	<version>0.60.1</version>
+	<version>0.60.2</version>
 
 	<properties>
 		<java.version>1.8</java.version>