Configuration
Allow to load more than one resources
Allow to set default resource
PhpDoc fix
PhpDoc fix
Update assets command.
Allow to set priority.
Allow to set filters.
Other many changes.
Add assets configuration file.
Update composer.json
We need symfony/process to use yui-compressor filters in assetic.
Allow to load yaml configuration files.
Update configuration files.
Move assets configuration file to defaults.
Use yaml instead php for application configuration file.