[lib/Bridge] Define default behavior for getName() and getURI()

Bridges no longer require implementation for getName() and getURI()
as they are now implemented with default behavior in BridgeAbstract.

This was previously implemented only for RSSExpander and is now part
of BridgeAbstract (automatically inherited).

Documentation is updated accordingly.

lib/Bridge.php

@@ -74,6 +74,20 @@ abstract class BridgeAbstract implements BridgeInterface{
         }
     }
 
+    /**
+    * Define default bridge name
+    */ 
+    public function getName(){
+        return $this->name;
+    }
+
+    /**
+    * Define default bridge URI
+    */
+    public function getURI(){
+        return $this->uri;
+    }
+
     /**
     * Define default duraction for cache
     */
@@ -365,15 +379,6 @@ abstract class RssExpander extends HttpCachingBridgeAbstract{
      */
     abstract protected function parseRSSItem($item);
 
-
-    public function getName(){
-        return $this->name;
-    }
-
-    public function getURI(){
-        return $this->uri;
-    }
-
     public function getDescription() {
         return $this->description;
     }