OpenCloud\ObjectStore > OpenCloud\ObjectStore\Service
Fix invalid Error-class import(s)
Merge pull request #172 from escapestudios/master

ObjectStore-method returns instance of OpenCloud\ObjectStore\Service
OpenCloud->last_modified details, second pass

Implemented a secondary check to get "Last Modified" information from OpenCloud
  if not already there from the DataObject...

This relies on the API response "extra_headers"
  but it only is called if the `last_modified` property isn't already set