Added the possibility to define assets to actions

Example configuration:

'controllers' => array(
'ModuleName\Controller\ControllerName' => array(
'actions' => array(
'actionName' => array(
'@collection_name',
),
),
'@base_css',
'@base_js',
),
),
Updated changelog
Fixed a small bug in changelog
Merge pull request #99 from mariomka/master

Added the possibility to define assets to actions