Chaging array_push call for array_merge, as the first one would produ…

…ce worng nested arrays in MediaView. closes #391

cake/libs/view/media.php

@@ -148,7 +148,7 @@ function render() {
 					$contentTypes[0] = 'application/octetstream';
 				} else if (preg_match('/MSIE ([0-9].[0-9]{1,2})/', $agent)) {
 					$contentTypes[0] = 'application/force-download';
-					array_push($contentTypes, array(
+					array_merge($contentTypes, array(
 						'application/octet-stream',
 						'application/download'
 					));