Added _uuid and _submission_time to csv exports
Added _uuid and _submission_time to xls export
Removed redundant async export test - export tests are run with celery eager to are covered
Use export model to store status and updated, export calls to require an export_id, added a commit after export create and delay to anyc calls
Added xls export fixture
pep8 to fornce travis re-run
Merge pull request #979 from modilabs/974_export_get_or_create

Async export fixes
be verbose, may prevent travis errored
Updated README with utf8 note

Updated to include a note on using utf8 character set within your database to support special characters.
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
Extra at sign on twitter handles specified with an at sign
use file extension of uploaded xlsform
test for xlsx xlsform download
Merge branch 'master' into xlsxdm

* master:
  Fixed tests to expect _uuid and _submission_time columns
  Added optional arg to make_submission to overide submission time for fixtures testing
  Updated README with utf8 note
  Added xls export fixture
  Added _uuid and _submission_time to xls export
  Added _uuid and _submission_time to csv exports

Conflicts:
	main/tests/test_process.py
explicit call to _publish_xls_form
Merge pull request #987 from modilabs/double_at_on_twitter

Extra at sign on twitter handles specified with an at sign
Merge branch 'master' into xlsx_xlsform_download

* master:
  Extra at sign on twitter handles specified with an at sign