by address reference
* add a one-to-many link between address and address reference;
* update AddAddress.vue to add information on picked address reference;
* add an HouseholdACLAwareRepository, with a method to find household by
current address reference
* add an endpoint to retrieve household by address reference
* + tests
edit context: display country for existing address
new context: repair editPane, load countries
note: adding id for country and postcode in address endpoint json
Two new routes:
* `GET /{_locale}/person/api/1.0/accompanying-course/{parcours_id}/show.json`: get a json representation for a course
* `POST /{_locale}/person/api/1.0/accompanying-course/{parcours_id}/participation.json`:
add a particitipation to course. Usage:
`curl -v --cookie "PHPSESSID=fed98aa23e40cb36e630f84155aea3bb;" -X
POST --data '{ "id": 481 }'
http://localhost:8001/fr/person/api/1.0/accompanying-course/270/participation.json`
Will add the person with id "481" to the course.
