[core] store parameters values in BridgeAbstract::parameters

This way, any BridgeAbstract method can now have access to these values,
no only collectData

Signed-off-by: Pierre Mazière <pierre.maziere@gmx.com>

bridges/DemoBridge.php

@@ -35,7 +35,7 @@ class DemoBridge extends BridgeAbstract{
         );
 	}
 
-	public function collectData(array $param){
+	public function collectData(){
 
 		$item = array();
 	    $item['author'] = "Me!";