Updated config and reference.json.config
* Added created_at_offset and updated_at_offset to config
* Added created_at_offset and updated_at_offset to reference config

Change-Id: I62f41aba7dafa22cc07b1606ea2a31f620cb05c9
Merge "Updated config and reference.json.config * Added created_at_offset and updated_at_offset to config * Added created_at_offset and updated_at_offset to reference config"