Update session-related schema

tracim/tests/functional/test_session.py

         assert res.json_body['is_active']
         assert res.json_body['profile']
         assert isinstance(res.json_body['profile']['id'], int)
-        assert res.json_body['profile']['name'] == 'administrators'
+        assert res.json_body['profile']['slug'] == 'administrators'
 
     def test_unauthenticated(self):
         self.testapp.authorization = (

tracim/views/core_api/schemas.py

 
 class ProfileSchema(marshmallow.Schema):
     id = marshmallow.fields.Int(dump_only=True)
-    name = marshmallow.fields.String()
+    slug = marshmallow.fields.String(attribute='name')
 
 
 class UserSchema(marshmallow.Schema):
     # TODO - G.M - 17-04-2018 - Restrict timezone values
     timezone = marshmallow.fields.String()
     # TODO - G.M - 17-04-2018 - check this, relative url allowed ?
-    caldav_url = marshmallow.fields.Url(relative=True)
+    caldav_url = marshmallow.fields.Url(
+        relative=True,
+        attribute='calendar_url'
+    )
+    avatar_url = marshmallow.fields.Url()
     profile = marshmallow.fields.Nested(
         ProfileSchema,
         many=False,