code: private static PBXObjectRef createXCConfigurationList(final List buildConfigurations) {
      final Map map = new HashMap();
      map.put("isa", "XCConfigurationList");
      map.put("buildConfigurations", buildConfigurations);
      return new PBXObjectRef(map);
    }
docs: Create XCConfigurationList.
  
  @param buildConfigurations
  build configurations.
  @return configuration list.