removed etag generation, unused anyway

vipra-rest/src/main/java/de/vipra/rest/model/Wrapper.java

@@ -83,10 +83,6 @@ public class Wrapper<T> {
 		meta.put(key, value);
 	}
 
-	public String tag() {
-		return data != null ? Integer.toString(data.hashCode()) : null;
-	}
-
 	public void addPaginationLinks(URI base, Integer skip, Integer limit, long count) {
 		if (skip == null || limit == null || limit == 0)
 			return;
@@ -131,7 +127,7 @@ public class Wrapper<T> {
 	}
 
 	public Response ok() {
-		return Response.ok().entity(this).tag(tag()).build();
+		return Response.ok().entity(this).build();
 	}
 
 	public Response ok(T data) {