Front end:
- integrating aura to symfony2
- d3-analytics aura extension.
- load D3 collections from the server api.
- load Data stores from the server api.
- building the entity form for the 4 entities.
- upload files through the data source form (using backbone and the jquery.iframe-transport plugin).
- installing & debugging the aura backbone extension.
- switch states feature.
- fix bugs related to sandboxes.
- import font files to avoid page loading bottlenecks.
- some css.

Back end:
- Doctrine2 Migrations.
- Data source controller: complete & secure the upload process.
- securing VisualizationController actions.
- Return the headers in order to get across cross domain policy issues.
- D3CollectionController's actions.
- D3Collection & Visualization repositories.

Signed-off-by: Kamal Farsaoui <elfa.kamal@gmail.com>