introducer UserCircleConsistency validator

This validator allow to check that the entity is consistent between user
associated with the entity, and the scope.

The entity is consistent if the user associated can reach the scope for the
ROLE "SEE/SHOW".

This is a Constraint with scope Class. Example of utilisation:

```
@UserCircleConsistency(
 *  "CHILL_TASK_TASK_SEE",
 *  getUserFunction="getAssignee",
 *  path="circle"
 * )
class MyEntity {

  // ...

  public function getAssignee() {
    // return user
  }
}
```

Resources/config/services/validator.yml

@@ -0,0 +1,7 @@
+services:
+    chill_main.validator_user_circle_consistency:
+        class: Chill\MainBundle\Validator\Constraints\Entity\UserCircleConsistencyValidator
+        arguments:
+            - "@chill.main.security.authorization.helper"
+        tags:
+            - { name: "validator.constraint_validator" }