This PR re-enables that feature. As the feature was considered optional depending on whether a user had botocore installed, I've updated travis CI with additional build environments to test Django with and without boto3.
A tox file was also added to simplify testing the different dependencies on local machines.
Using the the instance's IAM role to retrieve credentials was previously supported in <1.0 and lost when multi-upload support was added.
Ref: https://github.com/bradleyg/django-s3direct/issues/121
This PR re-enables that feature. As the feature was considered optional depending on whether a user had botocore installed, I've updated travis CI with additional build environments to test Django with and without boto3.
A tox file was also added to simplify testing the different dependencies on local machines.