message: add missing conventions property
diff: @@ -161,6 +161,15 @@ export class DocumentConventions {
  this._remoteEntityFieldNameConvention = val;
  }
  + public set useOptimisticConcurrency(val) {
  + this._assertNotFrozen();
  + this._useOptimisticConcurrency = val;
  + }
  +
  + public get useOptimisticConcurrency() {
  + return this._useOptimisticConcurrency;
  + }
  +
  public deserializeEntityFromJson(documentType: ObjectTypeDescriptor, document: object): object {
  try {
  const typeName = documentType ? documentType.name : null;
  