[AtomFormat] Remove enclosures

This feature was implemented for AtomFormat only and implemented by no
bridge other than DemoBridge.

bridges/DemoBridge.php

@@ -7,7 +7,7 @@ class DemoBridge extends BridgeAbstract{
 		$this->name = "DemoBridge";
 		$this->uri = "http://github.com/sebsauvage/rss-bridge";
 		$this->description = "Bridge used for demos";
-		$this->update = "2015-11-03";
+		$this->update = "2016-08-08";
 
 		$this->parameters['testCheckbox'] =
 		'[
@@ -59,7 +59,6 @@ class DemoBridge extends BridgeAbstract{
 	    $item->content = "Awesome content !";
 	    $item->id = "Lalala";
 	    $item->uri = "http://test.test/test";
-		$item->enclosures[] = "http://www.ardmediathek.de/ard/servlet/image/00/32/68/18/38/1135274624/16x9/960";
 
 	    $this->items[] = $item;
 

formats/AtomFormat.php

@@ -36,15 +36,6 @@ class AtomFormat extends FormatAbstract{
             // We prevent content from closing the CDATA too early.
             $entryContent = is_null($data->content) ? '' : '<![CDATA[' . $this->sanitizeHtml(str_replace(']]>','',$data->content)) . ']]>';
 
-			// We generate a list of the enclosure links
-			$entryEnclosures = "";
-            
-			foreach($data->enclosures as $enclosure) {
-
-				$entryEnclosures .= "<link rel=\"enclosure\" href=\"".$enclosure."\"></link>";
-
-			}
-
             $entries .= <<<EOD
 
     <entry>
@@ -57,7 +48,6 @@ class AtomFormat extends FormatAbstract{
         <id>{$entryUri}</id>
         <updated>{$entryTimestamp}</updated>
         <content type="html">{$entryContent}</content>
-		{$entryEnclosures}
     </entry>
 
 EOD;