Merge tag 'sparks-1.16' into develop

1.16
Introduce the new `DjangoTask` fabric task class, which checks we are at the good location before launching django related tasks.
fix `TypeError: migrate() got multiple values for keyword argument 'remote_configuration'`.
fix calling migrate() with arguments on fab commandline.
bump version in setup.py
Merge branch 'release/1.16.1'