Added _uuid and _submission_time to csv exports
Added _uuid and _submission_time to xls export
Added xls export fixture
Merge branch 'master' into export_instance_id_and_submission_time
Added optional arg to make_submission to overide submission time for fixtures testing
Fixed tests to expect _uuid and _submission_time columns
Merge pull request #982 from modilabs/export_instance_id_and_submission_time

Export instance id and submission time