deprecated "file_list" and "device" keywords

In the servlet job config file replaced:

- `"file_list": []` with `"devices": []`
- `file_list[]['device']` with `devices[]['name']`

The backword compatibility is maintained, but the old keyword names are marked as deprecated in docs
Merge pull request #40 from pkit/feature_new_config

deprecated "file_list" and "device" keywords