new configuration of fosrestbundle

[adnoh]

it seems I'm using a different version of fosrestbundle.
in newer bundles the config.yml part should read:
format_listener:
rules:
# setting fallback_format to json means that instead of considering
# the next rule in case of a priority mismatch, json will be used
-
path: './api/.'
host: '.*'
priorities: ['json']
fallback_format: json
prefer_extension: false
routing_loader:
default_format: json