Fixes
Slides for slider.
Merge branch 'master' of gitlab.hexmedia.pl:symfony-2/content-bundle
ListTrait for repository and controller, Slides

 - added ListTrait to almost all controllers
 - added ListTrait to almost all repositories
 - Slider is almost finished
 - Created AbstractType for all elements
Fixes in slider
Merge branch 'master' of gitlab.hexmedia.pl:symfony-2/content-bundle

Conflicts:
	Controller/SliderController.php
	Form/Type/Slide/AbstractType.php
	Form/Type/Slider/AbstractType.php
Id is always int (route regex), rewrited media controller
Id is always int (route regex), rewrited media controller
Seo and Publication traits applied
__toString methods in entities
Standarized list