Remove FilterRelation.In / "property IN" queries, upgrade googleapis{,_beta} dependencies

lib/src/db/model_db.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of gcloud.db;
 
 /**
  * A database of all registered models.
  *
  * Responsible for converting between dart model objects and datastore entities.
@@ skipping 26 matching lines @@
 
   /**
    * Returns the property name used for [fieldName]
    */
   // TODO: Get rid of this eventually.
   String fieldNameToPropertyName(String kind, String fieldName);
 
   /**
    * Converts [value] according to the [Property] named [fieldName] in [kind].
    */
-  Object toDatastoreValue(String kind, String fieldName, Object value);
+  Object toDatastoreValue(String kind, String fieldName, Object value,
+      {bool forComparison: false});
 }