Basic admin user would have ROLE_ACCES_ADMIN, so we have to authorized this role to access admin area
Move getter before load
Rename ROLE_ACCES_ADMIN into ROLE_ADMIN_CMS_ACCESS and split this role into 3 ROLES

ROLE_ADMIN_CMS_WEBSITE_ACCESS
ROLE_ADMIN_CMS_THEME_ACCESS
ROLE_ADMIN_CMS_PAGE_ACCESS
Update core bundle dependencies to add ROLES
Add Twitter block in the sandbox
Add build.xml and dev dependencies to be able to launch all tests from ant

prestaconcept/open-source-management#6
Fix admin-bundle version to 2.2.8

sonata-project/core-bundle has been introduce in 2.2.9.
this bundle introduces some BC breaks, so we currently have to stay in this version.
Also I remove some useless dependencies
Add travis profile for behat
Add zombie on travis
Configuration for behat, change context organization and add feature for test js/ajax fonction with behat and ZombieJS