Update admin create task
FEATURE: support txt file to be uploaded for bulk invite
fixing a handful of issues
Merge pull request #2490 from techAPJ/update_rake_task-2

Update admin create task
Merge pull request #2498 from awesomerobot/master

fixing a handful of issues
Merge pull request #2494 from techAPJ/bulk-invite-4

FEATURE: support txt file to be uploaded for bulk invite