Finish implementation of Doodle for Volley school
Add extension to handle resizes of images : AvalancheImagineBundle

To define a filter, update config.yml like :
        img_100_100:
            type:    thumbnail
            options: { size: [100, 100], mode: outbound, quality: 100, format: png }

To use a filter in twig :
            <img class="img-thumbnail pull-left" src="{{ u.user.picture| apply_filter('img_100_100') }}" ... />