DATACOUCH-51 - Call replace on batch update.

This changeset fixes a typo that exposed the wrong write semantics
when calling update().

src/main/java/org/springframework/data/couchbase/core/CouchbaseTemplate.java

@@ -145,7 +145,7 @@ public class CouchbaseTemplate implements CouchbaseOperations {
 
   public void update(final Collection<?> batchToSave) {
     for (final Object aBatchToSave : batchToSave) {
-      save(aBatchToSave);
+      update(aBatchToSave);
     }
   }