hb-no-dirty-check on password field. Only hitting 'Mettre à jour' button
actualy changes the user password signature and triggers form dirty
state.
Note: underscore syntax is provided by underscore.js library.
Added initWithUserRoles to select user roles among available roles.
Bound updateUserRoles to checkboxes click via ng-click.
Create USER ROLE implemented.
Layout.
Implemented USER ROLE deletion.