Api fix

Add photo url on /contacts api.

Limit list on admin views to related organisations, group type, etc

Fix some i18n issues

See merge request !7

Localisation

See merge request !5

Org admin

When a user connect on admin site he will see only objects related to organizations
he belong to.

See merge request !4

Mindiell qcc4

* Install process reviewed
* README file restructured and completed
* settings.py.sample added
* settings.py ignored

See merge request !2

Api

First version of REST API with minimal requirements

Valid routes are:
GET /campaings (should not be used)
GET /campaigns/<id>
GET /campaigns/<id>/contacts
GET /campaigns/<id>/arguments
GET /campaigns/<id>/arguments/<lang>
GET /campaigns/<id>/categories

POST /campaigns/<id>/feedbacks/

Some clean on data model and specially missing organization foreign keys

See merge request !3