Added index.php files to hide directory contents

git-svn-id: https://plugins.svn.wordpress.org/wp-piwik/trunk@934749 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added index.php files to hide directory contents

git-svn-id: https://plugins.svn.wordpress.org/wp-piwik/trunk@934750 b8457f37-d9ea-0310-8a92-e5e31aec5664