Merge pull request #7 from ANfactory/master

README.md correction
Updating requirements
Added an event trigger when a collection item is added in a collection form type
Removed dependency on doctrine / doctrine-bundle
Updated deps
Adapted paginator widget to Symfony 2.2
Added camelize twig filter
Moved navigation logic from twig extension to dedicated registry, accessible through the service container
Added temp fix for DDC-2276
Fine-tuned labels for collection and file / image types
Corrected Video Form Type (removed sf2.0 code)
Hotfix for file subscriber
Adding unaccent and sluggify methods to the Util/String
Added backbone and underscore in core
Replaced "sluggify" by "slugify"
Setting the file_path option as required
Updated doc

Added doc for snowcap_core_file and snowcap_core_image field types
Triggering the E_USER_DEPRECATED error + updating comments
Removing the dev requirement for stability
Adding missing alias for dev-master
Add 'add_active_path' twig function in navigation extension