bridges: Remove unused functions and update scopes

Many bridges implemented getDescription() which is only applicable for
bridges extending RSSExpander.

Functions that are not part of the abstract class or interface should
be in private scope for better readability.

bridges/FootitoBridge.php

@@ -7,7 +7,7 @@ class FootitoBridge extends BridgeAbstract{
 		$this->name = "Footito";
 		$this->uri = "http://www.footito.fr/";
 		$this->description = "Footito";
-		$this->update = "21/11/2013";
+		$this->update = "2016-08-06";
 
 	}
 
@@ -53,8 +53,4 @@ class FootitoBridge extends BridgeAbstract{
     public function getCacheDuration(){
         return 3600; // 1h hours
     }
-    public function getDescription(){
-        return "Footito via rss-bridge";
-    }
 }
-?>