Use .arkindex.yml for local dev

We should be able to use .arkindex.yml for local development too.

The model path could have an automatic substitution from /usr/share/teklia/models to ./models

A developer could then run the worker as : worker-xxx --slug=my_slug, instead of specifying a local file.

added 1 deleted label

added 1 deleted label and removed 1 deleted label

added Exploration P3 labels and removed P4 label

changed milestone to %0.3.6

changed milestone to %0.3.7

removed milestone %0.3.7