create script for uploading assets including user data

[hburgund]

Bulk spreadsheet-based (most likely) method for uploading a lot of assets and write the user data in the asset when uploaded and create new users when necessary.

Flow may be something like:

1. send POST users with device_id = "firstname_lastname"
2. response will include user.id either newly created if doesn't exist or pre-existing based on device_id
3. use user.id in subsequent POST assets/ call to create new asset with proper user attached